http://www.dotpocket.com/review2.html
if you are interested in changing screen resolution to something other than the standard 320x240, this might be for you.
it pretty much functions as advertised with the possible exception that video and photos can't seem to be expanded to fill the entire screen. i have emailed the company and should hear st within 5 days.
any chage requires a soft reset-but this really is not a problem.
perhaps the best aspect of this is a custom mode which allows you to specify the resoltion best suited for your purposes in both portrait and landscape modes. (there are a bunch of pre-set settings as well.)
nothing else that i have seen seems to work as well-and its price of $25.00 seems reasonable.
btw-also comes in a version for older units
charlie