Google Changes No Follow Attribute
The nofollow attribute for links has evolved from a way to fight blogspam to a power SEO tool. But its days in that capacity may be numbered, according to Matt Cutts, head of Google’s Web Spam team.
When it was first launched in January 2005, the nofollow attribute was described as a tool for site owners to identify potentially untrusted external links, such as blog comments. The idea was that search engine crawlers would not follow that link, not count it in calculating PageRank of the destination page, and not count the anchor text when determining relevant keywords for that page…read the rest here