BlitzWiki is a collection of free BlitzMax documentation written by users, for users. Our goal is to eventually include code samples, free game media (like fonts, sounds and sprites), tutorials, and of course documentation for each and every command in the BlitzMax library.
As of April, 5th 2007 the site says: "A brand–new BlitzWiki is coming soon. A new and improved BlitzWiki is being built from the ground up to work better for BlitzMax, and better for you too.".
Check the links and set it active again if the new Wiki appears.