about comments. Or, at least, I think so. If you have a Google account, it won't allow you to post a comment unless you first log in, then try to do it.
I now have an account with WordPress, and have the same problem. I can write a comment, but then a WordPress site will ask me to log in to publish it, so it probably works the same with a Google account.
I'm planning to keep this blog for now, but will try and experiment further with WordPress. So as of now I'm still undecided about the move, but will keep you all informed:)