I have Firefox with NoScript, so no - I don't get it. That's the entire reason I use all that stuff though... This forum & GWO occasionally get virii, it's just a tough fact.. Better protect yourself than not: Proactive vs reactive.
Make a note of the particular ads that are shown on the Guru page (I can see any because Firefox+NoScript is blocking them) and report them to the Guru staff, or here.
I'm not sure, but I think reading here that it's related to AdSense and/or googleAds.