There's a tool classifying the site Do Follow Links... Try Search Status tool in Mozilla... I'm using that tool now... Ok thanks!
I don't think this forum allows it. However, one way is to check the meta tags. Not really sure of any other way.
One of the quickest ways to check if a forum or blog is dofollow is this: Download the Firefox browser. Use it to look at a site. Just go to the link that you want to check. Right click on it. At the bottom of the little menu that appears you'll see "properties". Just left-click on that and it will tell you whether it is nofollow or not (that is, dofollow).