First, let us know the points we should take into consideration in choosing the satisfactory software which can rip DVD video to our mobile devices, such as Pocket PC, smart Phones and Palms, etc.
1. Cost/Performance: We all want to gain more with less money.
2. Conversion Quality: We all want to convert DVD to our Pocket PC, smart Phones and Palms, then we can have fun when we are moving, so the output quality should be considered seriously. Only if the output has high quality, can we get more pleasure.
3. Conversion Speed: Converting DVD often takes time, so if we have multiple DVDs to be converted, a high speed converter would be more important.
4. Easy to Use: Maybe we all like to use an application with simple interface and steps.
5. Personal Demands: For example, someone just wants to convert part of the DVD video, someone wants to add some captions, etc
Second, let me introduce the seven programs to you. And the specific comparison in the performance of those programs is in the following table
1 Wondershare Pocket DVD Studio
The software can easily and quickly create DVD videos for playback on Pocket PC, Palms and Smart Phones with great image and sound quality. Integrated support for batch converting will minimize the routine. You can convert entire movie, or just one or several chapters, Pocket DVD Studio will help you convert them one by one automatically. With a variety of custom settings, Pocket DVD Studio lets you choose the highest video quality suited to your pocket device type. You can adjustable bitrate video size, Resolution, etc. You can preview the movies before you rip them. You can also watch the movies at the same time when you are converting. It has the simple and user-friendly interface, and you can start converting in just three steps. And you can get more details from the following table. Generally speaking, this software is the best in these seven programs and I chose it at last. If the conversion can speed up a little more, it would be perfect. However, it's quite worthy of my 29.95 dollars. By the way, Wondershare Pocket DVD Studio is nominated as Annual Best Software 2006 by Smartphone & Pocket PC magazine. Smartphone & Pocket PC magazine’s Annual Best Software Awards helps users select software that best suit their Windows Mobile Pocket PC and Smartphone needs by honoring companies that produce outstanding software.

Price: $29.95 http://www.dvd-ripper-copy.com
2 CarryDVD
The software supports DVD to MP4, MOV, MJPEG, AMR 3GP, PPC OR Smartphone file format. It can extract audio from music or comedy videos, change aspect ratio, apply pre-set clipping, capture From TV or Camera (requires hardware), cut out with one easy click parts from the beginning and the end you do not want. Also, you can quickly preview to see how the video turns out, copy directly to the device for PocketPC, Windows Mobile, Smartphone. And it supports for sub-titles in any language available on DVD. Also, you can Limit play time to fit the size you want. As to some details, you can get them from the following table. The software sounds good, but after I used it, I found it was not worth of the name. The interface is very ugly and very rough-and-tumble.

Price: $29.99 http://www.carrydvd.com
3 Pocket DVD Studio
The software supports video files (wmv, avi, mpg, mpeg, rm, rmvb, Tivo2go, dvr-ms, mov, etc) and DVDs into portable format(wmv, avi). Better quality with blazing fast speed. It incorporates the world's fastest recording technique and provides better video quality. And it works for all DVD titles including those titles on which other products will fail or have audio problems (e.g. audio cut-out every a few seconds is quite common when using other DVD ripper).And it supports smooth aspect ratio control and cropping in both preview and recording mode. Also, it can remove movie black bars completely (works for all DVD and existing media files). And the software allows you to change codec, various audio, video, DVD setting, increase
brightness and audio volume, split video file to fit on several memory cards, etc. All these are easy to use and easy to test. A beginner can get started easily and become an expert soon with the help of an intuitive, friendly user interface. Generally speaking, the software is better than most of the seven programs. But the switch between batch dealing and alone dealing is discommodious.

Price: $34.95 http://www.pqdvd.com
4 Xilisoft DVD to Pocket PC Ripper
The software supports DVD to WMV、WMA, can check the CPU type and choose the best conversion way automatically. And you can see the all process in preview window; choose the start and last conversion time. Also, you can choose the result file’size, add the caption and background music. Output parameters are all adjustable. It's suitable for veterans as well. All encoders and decoders are built-in. It also supports ripping DVD by custom file size. Also, you can choose the interface you like and its interfaces are all beautiful. But there is not a good guide for the new users, so it is not easy to use for
them, especially for someone who has poor computer knowledge.

Price: $29 http://www.xilisoft.com
5 ImTOO DVD to Pocket PC Ripper
The software is very similar to the forth one. It supports DVD to WMV、WMA, can check the CPU type and choose the best conversion way automatically. And you can see the all process in preview window; choose the start and last conversion time. Also, you can choose the result file’ size, add the caption and background music. Output parameters are all adjustable. It's suitable for veterans as well. All encoders and decoders are built-in. It also supports ripping DVD by custom file size. Also, you can choose the interface you like and its interfaces are all beautiful. But there is not a good guide for the new users, so it is not easy to use for them, especially for someone who has poor computer knowledge.

Price: $29 http://www.imtoo.com
6 DVD to Pocket PC
The software supports home movies, DVDs and TV to your Pocket PC format. You can choose the output files’ size. Also, you can set some video and audio parameters. And the software has a very fast
conversion speed. The interface of the software is very simple, anyone can use it easily. But it only has a few functions and only can set a few parameters of video and audio. And it is a little expensive.

Price: $ 32.95 http://www.makayama.com
7 PocketDVDWizard
The Pocket DVD Wizard supports DVDs, Mpeg, Avi and DivX video to Pocket PC, Palm,PSP,iPod Video and more! It is very easy to use. It can works on any PC that can play DVDs using Windows Media Player. You can fit over 90 minutes of DVD video on a single 128mb memory card. Store 4+ movies on a 512mb memory card, 8+ movies on a 1 GB memory card. 'Black bars' on the top and bottom of the picture can be removed from widescreen recordings. You can record multiple episodes to separate files without additional user interaction and enhance the video brightness for small device screens and extend valuable battery
life. You can select high quality, balanced output or high speed-you make the choice. You can select alternate languages and subtitles. But when I used it, I knew it was not as good as it was said.

Price: $28.95 http://www.pocketdvdwizard.com
Third, let me make some summaries about the words above and give some suggestions for your reference. Though I am not an expert, I really hope you can get some useful ideas from my words.
Summary and suggestion
1) If you care about the Cost/Performance, Wondershare Pocket DVD Studio would be your most satisfactory choice. It supports most mobile devices with an acceptable output quality.
2) If you care about Conversion Quality. Pocket DVD Studio would be your most satisfactory choices. Its professional parameter settings may ensure you an excellence result.
3) If you care about Conversion Speed. DVD to Pocket PC would be your most satisfactory choices. Its New Cyberspeed technology ensured 350% faster DVD conversions.
4) If you have multiple DVDs to be converted, or you just want to convert partial of the DVD. You can choose Wondershare Pocket DVD Studio, Xilisoft DVD to Pocket PC Ripper or ImTOO DVD to Pocket PC Ripper.
5) If you are Chinese or Japanese, Wondershare Pocket DVD Studio or ImTOO DVD to Pocket PC Ripper would be your best choice.
6) If you have poor knowledge in computer. You can choose Wondershare Pocket DVD Studio, DVD to Pocket PC or PocketDVDWizard, because they are very easy for you to use with their particular user guide.