Some SEO changes you can make
I went through my site and added rel="nofollow" to a ton of outbound links. In particular, every directory button, every social networking site, every wikipedia mention, and Flickr.
Why? There is no particular reason why I should give them link juice. Wikipedia especially...they "nofollow" every link on their site. So does Flickr.
I probably removed hundreds of links across all my pages. All of that which will stay in house for my PR or towards sites which I choose to give my link juice to.
This is independent of your decision to "nofollow" comments. If you "dofollow" your comments, putting "nofollow" on all the extraneous links to big sites will just send that much more link juice to your commenters.
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