Blog/Wiki Hybrid?

Question

I want to start a blog that has public editing rules, like a wiki. Is there such a thing?

Edit: That is also hosted (like Blogger) or a method I can host it on a web space (such as Google Pages)

Answer 1

Wikiblog comes to mind.

Answer 2

Try http://pbworks.com/ (direct). It used to be called Peanut Butter Wiki and it allows for editing.

Additionally you can check here for more similar sites: http://c2.com/cgi/wiki?WikiFarms

Answer 3

Posterous allows for collaboration

as does Google Sites.