I have found two programs that really work for stopping pop-ups. One is the suggestion that Belial made above. I use Mozilla (1.6) as my primary browser. For the cases where I still need to use IE to browse the web I have installed the google.com toolbar for IE. It has a built in pop-up stopper that works very well and is free!

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-Toast-
"It takes a lot of brains to enjoy satire, humor and wit - but none to be offended by them." -- Johnny Hart ("BC", cartoonist, 2000)
"Analyzing humor is like dissecting a frog: Nobody really enjoys it and the frog generally dies as a result." -- E. B. White