Define the scope and purpose of the blog. Is the blog about the site? Is it about the site’s topic? Is it about the industry around the topic? Keep in mind the audience of your community and their interests. Another generic blog about may not be all that interesting. A community blog should be interesting to both current members and potential new members.
We need to pick our topics and what specific sorts of posts we will have. Keep one idea (Question of the Week, UX reviews, UX studies ect) per answer and flesh out the specifics as much as possible. Feel free to post multiple ideas and comment on what works and what doesn't work.
I'm making this Community Wiki so we can all specify and define the specific ideas we want to make work.
Vote up ideas you would be interested in reading or writing. Vote down ideas you think are not appropriate/wanted for the blog. Comment or edit to improve existing ideas if you think they can be better.