Yahoo. For some reason, whatever comes back on a Yahoo search is usually what I'm looking for, and Google's results aren't. I'm sure it's just good/bad luck, but that's just my experience. Plus, I like being just a click away from a Yahoo Answers search. Even though 75% of the stuff there is total stupidity, if I'm having some sort of problem, I can usually find something there if a normal search doesn't find anything useful.