When I went to a download page for a windowBlinds theme, I got the nice new popunder, followed by a warning from my antivirus software (McAfee) about a file in my temp internet files folder having the wmf exploit in it.
To link to virus info: http://vil.mcafeesecurity.com/vil/content/v_137760.htm
While I know it could be a false-positive, you should probably look into what kind of ads are being put on this site. It's one of the fastest ways to make people not want to come back.