Wiki2Touch is an offline reader for Wikipedia articles for the Apple iPhone or iPod Touch.

Targeting the iPhone or iPod Touch platform this project is a reader for Wikipedia articles. The compressed backups can be downloaded from Wikipedia. Not needed data is removed and the result is recompressed. Then an index of the article names is created. The result must be uploaded to the device. Using this software you can then search and display the contents of Wikipedia offline.

http://code.google.com/p/wiki2touch/