Wordpress has a feature which puts

rel='external nofollow'

in any urls that appear in comments, including the link to the posters own site. This is, of course, put there to stop spammers, but I believe somebody who’s taking the time to comment at my site should be able to benefit from it, and I doubt it will cut down much on spam anyways.

Well, I found a plugin that strips the “nofollow” from the rel tag, you can check out the plugin for yourself here: Strip “nofollow” tag from comment URLs