Bayden PopupPopper -- "Take command of your browser... Blast unwanted popups while still allowing them from sites you trust. Banish unwanted popups forever! Unlike many other popup-removal programs, PopupPopper contains no spyware and allows you to control what gets popped and what does not. Try it and you'll never go back to an unprotected browser." (Comments: I've seen this mentioned in a couple of places. Those that use it, rate it highly.)