I updated my copy of AVG to version 8 recently, and discovered that they've added a while bunch of new features. One of these is LinkScanner. When you do a google/yahoo/msn search, LinkScanner inserts little icons into the search results to let you know if the site the link goes to is likely to be hazardous to your computer. This is pretty cool. Unfortunately it tests the pages by actually downloading them (and any javascript files they reference) so I suspect it's going to be unusable on a dialup connection. You can't turn it off, or AVG complains that you've turned off component.
There's a thread about it on Webmaster World, wherein it's shown that LinkScanner is actually quite easy to spot, so it would be quite easy to fool. Not only that, but it only scans search results, so once you go to a site, you're on your own.
The new GUI looks very slick though.