<a href="http://www.dpreview.com/articles/mediacompare/">http://www.dpreview.com/articles/mediacompare/</a>
I found this article very interesting, it was designed to aid Digital Camera buyers in which memory will give them the most bang for their buck, but it is also quite useful in the PocketPC arena. They compare 20 different brands of Compact Flash cards in their writing/reading speeds. I was surprised at the low performance of Sandisk, which is a big name in the flash market. A good read if you are looking to drop some money on extra storage.