Really good one, been using it regularly for about 2 yrs - from time to time I disable it to see what I'm missing - omg, pop ups are freakin evil!
btw Promoxitron is comletely free and extremely effective, customizable and has a low resource impact. The ability to block a wide variety and manage outgoing data, identity, redirection, and other _many_ controls are much better than some of the "block pop-ups checkbox" native with some browsers.
I use Proxomitron in combo w/ Ad-aware, and trojanfinder. Google was cool, but then they got bad - as in tracking cookies that last until 2032 that identify the serial number of your hard drive. Ties to the US government and other data tracking and logging of customers have been allegations, which have been gaining in strength. The google toolbar is supposedly even more invasive than other spyware. (Gator Corp should just ... die, imho) Will post more links on the subject when I find 'em here.