I thought it would be awesome to have a portable Wikipedia on my Cowon D2 (it is an MP3 player with a display), so I programmed one!
As the full Wikipedia is a bit too big (i think it has over 7 GB on text files alone), I found a subset of articles at the SOS Wikipedia for Schools project, with about 4500 articles.
Download V0.2b here (427 MB): http://rapidshare.com/users/LHDUO0 Alternative (may be slow): wikid2_v0.2b.zip Torrent: http://www.mininova.org/tor/1300489
Patch to V0.4beta (1 MB): http://rapidshare.com/users/LHDUO0 Alternative: http://www.cyphire.de/d2/wikid2_v0.4beta_patch.zip
Instructions: Unzip full version on your D2, unzip patch and replace original files.
When you start wikid2 (choose touchpad), it'll load the index. Click on blueish hyperlinks to follow them. Scroll by clicking somewhere on the screen, the lower you click the faster it scrolls.
Feel free to report errors in this thread. Enjoy!