I've been waiting for something like this for a while. Wikipedia is all very well and good - I'm a regular user, as anyone who clicks on my links can tell - but WetPaint
lets you set up your own wiki, and brings all the ease of use of blogging to the experience. You can set up a wiki thats open to all, limitted to wetpaint users, or locked down to those who have password access. It takes seconds to set up a wiki, the interface is seemless, and the templates they offer are just gorgeous.
Why are you still here? Go play