A few days ago, I installed Defensio Anti Spam plugin. But it did not work well and I uninstalled it.
One unusual thing it did was mess up my comments count. Now, total comments are always 5 more than approved comments. I thought uninstalling would do the job but it did not help!
Here/s how my comment numbers look: http://img517.imageshack.us/img517/5958/spamproblem.png