Never seen any here.

IE6 on XP w/SP2 + Google toolbar w/google popup stopper + PestPatrol + AVG antivirus + AdAware + SpybotS&D. Also have IE set to clear temp cache & history on close.

This is October. In the previous 9 months of 2006, 5 (five) popups have made it thru while I've surfed the Org. I'm certain of that number, because I recorded the sightings. Your mileage (and browser & defense measures) may differ.