metv.com is one such example. The popups are so furious that it's very difficult to browse the site or even close the browser tab. Maybe what's needed is a cache option for user responses, so Cancel really does mean Cancel?
Incidentally, Opera Mini was originally devised a low memory, data-saving client, so we do need this feature for sites that bend over backwards to shove video streaming down our throats. More of this please, not less, but the popups are a real issue.