I've tried several 'Pop-up ad killers' over the last couple of years, but there always seems to be something or another that conflicts with my 'surfing' habits. None of them are perfect, but I wanted to let ppl know what I'm currently using, in case you want to check it out. It's called Bayden PopupPopper and it's freeware.
Bayden PopupPopper works as good as anything I've tried, it's simple, and it's freeware. Here's their URL:
http://www.bayden.com/popper/
Let me know if you're using something better...