Comment on WordPress SEO Nofollow by Mostly Technical.
Akismet does do a great job of filtering spam. I find that it works very well on my WordPress sites.
I’ve given up on Akismet for Drupal sites however. It really slows down the commenting process for visitors. I assume this is due to how it is implemented in Drupal.
I’ll try Bad Behaviour on your advice. I get so much spam caught by Akismet that I’ve given up going through it all looking for false spam.
I’m just looking into removing rel=nofollow from my blog. Part of blogsphere is supporting other blogs, and I think that rel=nofollow throws the baby out with the bathwater, and does nothing to reduce spam.