Over the weekend, I had the thought, "Who owns the comments on this blog?"
The Reasonable Man blog has a nice summary of copyright law on this issue and I think Charles' interpretation of the law is a well-reasoned one. While I already had a Creative Commons copyright notice on this site, I added the following sentence:
Note that when you leave a comment on this site, you are agreeing that your comment also falls under the terms of this Creative Commons license.
Remember, just because the blog comment was posted in public view doesn't mean it's still not copyrighted. The commenter doesn't give up ownership of her post just because she left it on your site. Now, do I agree with the law on this one? Absolutely not. But that's the way it stands right now...