[troyb]

I thought I'd also add that you can do this through the address bar now. Each shortcut has keyword that can be typed into the address bar in order to access it. So for instance you could do this:

In the address bar type: "google your search terms"

without the quotes. This will do a search for "your search terms" at google and return the results in the same tab or in a new tab if you hit Command-Enter.