While it is no muppet wiki, Camerapedia.org aims to “be a repository for information and links to information about all still camera brands and models” and could develop into a great resource for every photographer.
Currently, some camera models have been covered extensively, such as the Canon 300D, whose entry includes official product sites, reviews, links to firmware updates, links to photobloggers who use the camera and tutorials specific to the camera among other things. Other entries, such as for the Canon 1D Mark II, contain nothing more than a blank page.
Luckily for photographers, that is one of the beauties of a wiki; anyone can contribute. As the site says, “You know your camera equipment better than anyone. Please share that knowledge with everyone and contribute.”