From SurfSecret Software:
PopupEliminator blocks pop-ups and pop-unders that slow down and destroy your surfing experience. PopupEliminator installs in seconds and blocks all pop-ups. PopupEliminator catches pop-up and pop-under advertisements before they reach the browser window, so you don't have to download them. This prevents pop-ups from leaving cookies on your system and using your bandwidth. PopupEliminator sits in the tray bar, constantly blocking pop-ups.
The program features an integrated Internet Explorer toolbar; Netscape and Internet Explorer support; a list module; and a context-sensitive help system. Users can add sites to an allow list to permit pop-ups from certain trusted domains.