Big 3 Engines Team Up to Fight Comment Spamming

Google Blog, MSN Search Weblog and Yahoo! Search Blog all mention a new initiative to help fight those who seek to promote their own sites via public Blog comments. By using a tag property that can be added to your templates to tell the engines not to spider specific links, such as any appearing in your comments area. I imagine this could be used for any links, so it's yet another thing to look for when trading backlinks to make sure you're getting your link's worth.