As you know, I use Google not only as my search engine but also instead of, e.g., bookmarks, a dictionary, a spell checker, a phone book, a life. If you too are a constant Googler and have never checked out the Google Labs, you should. I've become recently enamored of the Google Deskbar, which allows you to Google away without even having to open your browser. But possibly the coolest thing, although I raise the issue now even though I'm too tired to construct examples indicative of its merits and powers, are the Google Sets. Type in actors, musicians, geographical locations, dwarves, reindeer names, whatever, and watch it try to figure out what else would belong in that group.