As i have been developing Flash applications for my n(00 since i
bought it, let me suggest you what i have learned through the last
months:

As referenc i state my fullscreen widgets project
at http://www.mojocafe.net

Though the device is able to handel Flash 9.x you should think
about the downgrading option of your games so that they would
also play on other devices.
Nowadays there are nearly a dozen of devices offering the
800x480 screen resolution, so it would be awesome to be
able to play your projects also on these devices (e.g. Archos).

Two weeks ago i relaunched the Mojocafe and downgraded the
widgets to Flash Lite 2.1 to be able to offer the project also to
mobile devices that do not have that much horsepower.

my advice in short: if you plan to develop your stage at 800x480
do so that your games will also be playable on other devices
with the same screen size.