Dingoopedia - Wikipedia for Dingoo.
A basic, text only mirror of Wikipedia on the dingoo. Basically, this thing: http://thewikireader.com/
, but simply as a software program. According to that website, the text-only mirror of wikipedia is about 4GB. This is of reasonable size to fit on a microSD card and use with the dingoo.
I think this would be awesome, and with a little know-how probably not too difficult (although I could be very, very wrong on that). It seems like the most difficult part would be navigation: a search system is an absolute must, meaning you would need to have both a good search algorithm and a good input method (onscreen keyboard).
I don't really have the knowledge or time to do this myself, but I figure it's worth throwing the idea out there. Hopefully somebody finds the idea of the word's largest encyclopedia in your pocket and ready at any time (not just at a wi-fi hotspot or 3G area) as exciting as I do