Inquisitor - nice addition to Safari
I mentioned before that I really like the Spotlight feature in OS X. Well, a friend mentioned that I should check out Inquisitor, a Freeware Spotlight like add-on for Safari.
It's about as simple as it gets - rather than typing text into the Google search box in the upper right and seeing the Google results page, you can see a preview of a few pages right there at the top.
One brief word of caution though; if you install it, make sure you are done with everything you have in your Safari tabs because without warning it shuts down Safari.