Why do websites put a "search the web" searchbox at the top of their page? If I'm on site X and I want to search for something, I want to search on site X, not across the web. If I want to search the whole web, I'll go directly to the search engine. I'm trying to imagine a usage pattern that makes sense for this.... it's not like I'm going to go to sfgate.com when I want to search the web, and when I'm already on SFGate I probably won't remember that the search box is up there.
IMDB used to drive me batshit with this, though I think they've removed it now.