Check out the FamilySearch Wiki

A wiki is a type of computer software that allows users to easily create, edit and link web
pages. Wikis are often used to create collaborative websites, power community websites,
and are increasingly being installed by businesses to provide affordable and effective
Intranets or for use in Knowledge Management. Ward Cunningham, developer of the first
wiki, WikiWikiWeb, originally described it as "the simplest online database that could
possibly work." One of the best-known wikis is Wikipedia. (Encyclopedia Britannica,
2007) See http://www.wikipedia.org/

At http://wiki.FamilySearch.org The Church of Jesus Christ of Latter-day Saints has started a wiki for supporting genealogical research. It is a valuable tool for both beginners and the more advanced researchers.