Wikipedia offers static html dumps on download.wikimedia.org/static.
The german wikipedia dump is 1.4GB compressed with 7z and uncompressed it is probably way way way bigger than 2GB (somewhere i have read that a 1.9GB english 7z is 27GB uncompressed).
And this does not include any images! (AFAIK)
I would not hesitate to buy another 2GB Card to have the wikipedia with me all the time because many times i walk around and wonder about things i see and it would be super-awesome if i could look it up immediately.
Now, do you think one could format the Card with this compressed filesystem thingie which the 770 uses internally and can anyone possible guess how much space you could save this way if all you put on it are html-files?
html seems to compress nicely, right?