I've been getting a huge number of spam comments. My point is, I don't care if they do it, they are just wasting their time as far as I'm concerned. I just hope none of my friends write comments under anonymous that get snagged by the spam filter, because I just delete them without reading them and I wouldn't want to miss a good comment.
With that said, if you do use anonymous as a Google name, it would benefit you to establish some type of Google name and password. I'm sure a lot of the other bloggers do the same thing and we wouldn't want to miss anything important.
Just a thought, mind you.