Zilla Popup Killer 

Block pesky ads, popups, pop under & spying cookies in Netscape, Internet Explorer, and Mozilla, AOL, Opera. Can also be started manually or at windows startup or with your browser window startup. Instant Notification - Play one of many sounds.
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BestToolbars.net Pop Stop popup killer 

FREE pop-up killer blocks 100% pop-ups and pop-unders. Kills unwanted pop-ups but allows new window links that you click. Surfing will not be the same again. Eliminates popup or popunder without even opening it!
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AdsEliminator 

AdsEliminator kills pop-up windows in all popular browsers, has an impressive list of settings and popup ads filters, provides a log of popup that were stopped. AdsEliminator increase your Internet browsing speed by reducing unsolicited ads.
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