FWIW, I used to use Popup-stopper (free edition), but since XP SP2 I find that there is no reason to use it.

Loadsgood wrote:
No, my app isn't free - I use NIS '04 (Norton Internet Security 2004) for my popup blocking needs.

I didn't include popup blocking in the list because IE already has a built in popup blocker (Service Pack 2 update for XP)