I think many forget that advertising on websites is actually making websites possible. It gives a bit of revenue to the people behind the websites, and using software to block ads could be considered as stealing from the webmasters behind the website.
I run some ads on PeatFreak too, which by the way, only pay anything when people actually click on them. Currently its not even enough to pay me back the costs for the hosting alone... But as they are not very intrusive (IMO, and I havent heard any complaints about them, in fact, some told me on each visit they click a few! (thanks guys
)) I'm going to leave them on for now.
That said, I fully agree that popup/under windows are really annoying. I run Firefox, and had popups as well loading on each page, and am sorry to say I disabled the possibility for this website to open new windows. I did not however blocked the banners showing on the pages