Spamdesking (blog commenting) seems like, has been put to a bilateral end, which I guess is a good thing.
This likely happened between the collaboration of Google and Wordpress. As soon as you upgrade to Wordpress 3.1 latest release, all comments "hrefs" are automatically given a "rel" of "nofollow".
(People who know what a "nofollow" meta tag is, they'll know what it means!)

I have seen this happening quite a lot of times so wanted to let you know that doing so is pretty useless know for link building.

Cheers and lets come up with better way of ranking up!