Ditto on the Proxomitron. I even use it to filter parts of this site that I don't use, like the printer-friendly view.
PopUp Stopper Pro can be purchased through panicware.com for, um, $19 I think. (I think I'm sounding like Kodos now.

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The Unpronounceable Krsqk
"Well, sir, at the moment my left processor doesn't know what my right is doing." -
Freefall