Blacktree, the makers of the über-launcher-love-tool Quicksilver, has a great listing of all of the Quicksilver tutorials to be found around the web. If you are new to Quicksilver or even an old hat looking for a new trick, this is a great place to start your search for nirvana.
If you are a Mac user and you have not tried Quicksilver, I can’t tell you how highly I recommend this application. It is really one of those things that Apple should just buy and build into the Mac OS. Seriously.