This is a great idea Dan, and appreciated by all the devs I'm sure, but it seems too biased.
Are you gathering votes from the wrong people? Seems to me most of these votes will be from developers or PPC 'hard core gamers' which we all know aren't the mainstream and probably the ones we shouldn't be optimizing for.
A better way to collect this data might be to use Handango or PocketGear, somewhere where real consumers can vote. Even if you put it on PocketGamer the results would be too biased.
A quicker method: Maybe you could just email big software distributers (AIM, eSoft, and PDAMill) and politely ask them for their Handango PPC device lists (from their sale emails or monthly reports), or perhaps just the last 1000 they've received. Then simply tabulate the results. This way your getting the most useful results of them all, from people who actually bought software :)