" I figured this was too technical for me to bother with in this blog until I read this extension of the idea from Robert Scoble.  Not only can this new tag be used to keep spam out of search engines, but using it, bloggers can link to sites they don't like without inadvertently helping that site's search engine page rank.  Read Scoble for a more specific example, and here's an introduction to the piece of code, called "nofollow."  This won't be on the test, but it's still interesting to see the Internet community work together to solve mutual problems...."

http://www.msnbc.msn.com/id/6409077/