The view onlineWikipedia – A valid source for trademark matters?

A legal storm is brewing over the use ofWikipedia, the online encyclopaedia, as avalid source in trademark decisions, as wellas general legal matters. While Wikipediahas been cited by numerous US federal courtopinions in the last year and in three recentdecisions of the USPTO Trademark Trial andAppeal Board, is it acceptable to use a sourcethat is a moving target, changeable byalmost anyone at almost any time?