I'm crazy about POW! The reason the eliminator is not automatic is because there are some windows that would be closed, even if they're not pop-up ads. For example, when I sign onto any secure space on my college website, a status window pops up to tell me how much time I have been logged on. On some of the other pop-up killers, that window would be closed.
I have to use AdAware AND POW! But not for long, I'm getting a Mac.