As an added update, when checking my links in Yahoo, I notice almost EVERY post I made here is credited in Yahoo as a link to my site, and that's ALOT of posts/links.
Also since I got
SEOQUAKE toolbar or the
SEO Firefox plug in, which does the same, the nofollow links are highlighted in red for me automatically on every site I am on, makes life a lot easier to not have to check each link!