Register: “Early on Saturday morning some banner advertising served for The Register by third party ad serving company Falk AG became infected with the Bofra/IFrame exploit. The Register suspended ad serving by this company on discovery of the problem.” Posted via Scripting News
Ouch. Bofra is an unpatched Internet Explorer exploit for any Windows machine not running Windows XP SP2. Follow the link above for suggestions on decontaminating your machine if you think you may be affected by this.