The result was Transwiki. Based on the comments, there is an consensus to transwiki, as Wiktionary and Wikibooks are not interested, the third most popular option is Wikiversity. MBisanz talk 05:50, 19 April 2009 (UTC)[reply]
This is useful, but not encyclopedic. Maybe a transwiki to b: or v:, or meta? — This, that, and the other 10:14, 12 April 2009 (UTC)[reply]