I think that's a great angle to take.

One issue is that this won't really be a unique advantage that Maemo has over the competition for very long (i.e., when flash 10.1 is release for Windows Mobile 6.5 and Android), although it may be fair to argue that the N900 has the hardware to run these flash apps better then many other phones on the market.

I also think that it would be great if someone wrote an app/browser extension that made it dreadfully easy to find and save flash content for offline gaming. Being the first system to market with an easy way to play your favorite flash games offline would be a good unique selling point. I know it wouldn't be trivial to make this work with all flash content, but even something basic to begin with that could say save this - http://www.albinoblacksheep.com/flash/castle - locally would be good. Even better would be integrating youtube ripping functions.

This might start running afoul of copyright (I don't think so because generally you're just moving something from temporary internet files to permanent files, but programmers should tread lightly/consider adding a disclaimer). More advanced stuff like google docs might require google's help (i.e., google gears) to get offline access, but I think making it easy to get offline access to flash content would be superb.