Google has added a feature to they search algorithm that ignores links that have the rel="nofollow" tag in them. This is great because it let's google know what information is your and what information was just posted by somebody commenting. They have recommended the nofollow tag be used on all links that can be posted by untrusted users. MSN Search and Yahoo! are both supporting it. Most blogging applications have already incorporated it. I am going to add it to my system too. Here is the link to the original article on Google's blog.
"A one night parade of sweat and adrenaline pitting viewer against viewer in brutal virtual cockfighting theatre. Audience volunteers will don custom-made wireless game controllers with full sized wings and feathered helmets. Combatants will step into an arena to control their life size game avatars through vigorous flapping and pecking, competing for blood and birdfeed while rapaciously inflicting onscreen bodily harm. Cockfight Arena is free and open to the public. Gambling and smoking will be permitted. No animals or humans were injured in the production of this event."