What infuriates me even more than the blinking ads are websites that have the tracking scripts embedded in such a way that they break page functionality if they are blocked.
I block most of the major ad networks at the DNS level, but I've increasingly found that doing so breaks a number of major sites that use these networks for analytics purposes. Blocking the marketing network "2o7.net" (run by these guys) stops links on Apple's website from working (unblocking the provider and flushing my cache resolves the issue). Other networks break my bank's website (I think I need to change banks) and some airlines in a similar fashion. There's plenty more out there.
I'm sorry if I'm making things rough on ad-supported sites, but I'm not willing to have Apple and my bank track my way around the internet so that a few blogs can serve up ads uninterrupted.