Sick of adverts? Go download Firefox 2 and then get the Adblock Plus extension and you will never see an advert again. The addon says it blocks %99.99 of adverts and I believe. As an added plus, you can also block the annoying pictures in peoples sigs.
-edit-
whoops. people talking about the glory of Adblock before me. Still though, it's great. I didn't have to train mine except for the first time you use it you pick your region and blocking random pictures I just don't want to see.