What I'm seeing a lot more of, since the popup blockers got more common, are more animated ads placed/embedded directly in the main window, with essentially the same sort of stuff that used to open a separate "popup window." Since the stuff is a part of the page you want to see, there's no good way (yet) to block them and still see the wanted material. Of course you can block all animations with most browsers, but that affects how you see other stuff, some of which you may want to see - or not.

John