Yeah. QuickSilver is amazing. One thing I do a lot with it is Web Search, make sure to enable that module of QS.
Once you have it enabled, it just makes your web searches so much easier. For example, I decide I want to search for Steve Hoffman on Wikipedia. Invoke QS, type Wikipedia Search in the first panel (or in my case, since QS learns and anticipates, I just type "W").
In the second panel, choose "Search for".
In the third panel, type "Steve Hoffman". Then press enter.
QS then OPENS the application Firefox (or Safari, or whatever your default browser is), then goes to wikipedia, and opens the Steve Hoffman page for you.
It may SOUND more convoluted than just opening firefox yourself, navigating to wikipedia, etc... but really, it's not. It works for a number of web searches as well, like youtube, google, imdb, etc... A LOT of web searches.
The only one I use regularly that doesn't seem to work is nudography.com.