Worse Internet "Invention"?
That thing where you go to a page, then the page freezes while it slowly fades to an ad. I hate that. I really really do. Worse than pop-ups.

Flash ads are really crappy. But not as crappy as MySpace pages.

I hate myspace... it's a brilliant tool and what not, but man.... the fucking ads! what about the ads where if you happen to mouse over it, a commercial starts playing on you!