I just found this info about the no follow tag being introduced to fight spamming of blogs and perhaps forums too.
It effectively will reflect on the popularity of your site because any links posted that have the "no follow" tag will no be counted.
Going to be used by:
Google (Search and Blogger)
Yahoo (Yahoo Search)
Microsoft (MSN Search and presumably MSN Spaces)
Six Apart (for Movable Type and Livejournal)
WordPress
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