I think Wikipedia's logo is groovy, but it says nothing about the fact that Wikipedia is an encyclopedia. That was my first thought. Then I looked at a page and imagined that I had just stumbled across it on the net, and had no idea what it was about. It is simply not immediately obvious that Wikipedia is an encyclopedia!
So, maybe what we could do is have a logo that says that Wikipedia is an encyclopedia. At the same time we might adopt a slogan, something like "The user-created encyclopedia." Ideas?
Larry