General information on the GURPSwiki:
Yes, there is a wiki for GURPS and largely due my 2 years of work it is getting a lot of updates and is no longer little more then 'Title, book, page number' but actual useful information, much of it from here as well as making extensive use of URLs to flesh out material far more then is possible then in even a PDF book.
The biggest longer term project on the wiki is
Five Earths, All in a Row a kind of Infinite World superlite.
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Help make a digital reference for GURPS by coming to the
GURPS wiki and provide some information and links (such as to various
Fanmade 4e Bestiaries) . Please, provide more then just a title and a page number.