The Apple Blog has a lengthy introduction and tutorial on how does QuickSliver work and how does it help you to speed up your operations on OS X:
OK, what does it do?!
Short answer: It’s a launcher. It allows you to open files from a keystroke instead of clicking through the Finder for them.
Long answer: What doesn’t it do? QS indexes your hard drive into a Catalog. That Catalog is available at a single keystroke and then allows you access to everything on your computer. Not only can you open applications, but using QS, you can move files around, append text to files, locate a file and attach it to an email…The list goes on and on and on and…
Quicksilver Changes Everything – [The Apple Blog]
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