I like the pop-under ad for gambling when you visit this site. Classy.
I assure you, I do not have malware.
It happens when the justin.tv widget in the side-bar loads. It attempts to load something that redirects to http://rts.pgmediaserve.com/03d458/
I have Little Snitch installed and locked down so it can't make any connections, but it tries two different sites over SSL in an attempt to fetch content for the frame.
Curiously it works with AdBlock enabled, too.
john (founder of the site)