Pocket PCs can now do VGA i.e. 640 x 480 pixels—at least with third-party software. Here are three screen captures that provide pretty convincing proof of how useful this can be. They show a PDF instruction manual for a Seiko watch as viewed on the Palm T3 (480 x 320 pixel screen; Acrobat Reader displays non-native documents at 160 x 160 resolution) and on a Dell X50v (native PDF at semi-VGA and "real" VGA resolution). If a picture says a thousand words, here are 3000 on the difference...
Page 9 viewed with Acrobat Reader 3.05 on Palm T3:

Page 9 viewed with Acrobat Reader 2 on Dell X50v at "native" VGA resolution:

Page 9 viewed with Acrobat Reader 2 on Dell X50v at "real" VGA resolution:

Want to know more? There's a very detailed discussion on VGA issues here.
Update 15.11.05: With the release of Documents To Go version 8, Dataviz introduced the ability to view native PDFs on the Palm. Here's how it renders (badly, slowly) on the T3:












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