QuickSilver: just works, and selects correct thing you might be looking for. Spotlight: is slow, show all kinds of crap you are NOT looking for. To add insult to injury it also requires typing way more characters to get a hit, and requires several keypresses to select that item, not just return.

Z does for cd what QuickSilver does for the Finder. It's totally awesome: https://github.com/rupa/z