Wikimedia DVD and Offline Downloads

The following kinds of DVD downloads are available:

German Wikipedia 2007/2008
German Wikipedia, using the ZenoReader (Windows) and TntReader (Linux / Unix / MacOS X, GPL).
Wikipedia 0.5
Selected articles from the English Wikipedia.
Polska Wikipedia na DVD
Polish Wikipedia.
Version 0.7 Spanish Wikipedia
Spanish Wikipedia on CD/DVD

Other offline readers

Multiplatform offline reader, with downloads available for multiple projects and languages
OpenZIM archives
German Wikipedia in OpenZIM format. (Open-source version of reader software under active development)
Offline reader for multimedia contents. It's especially thought to make Wikipedia available offline.