I've got the Google toolbar installed and I love it. Mainly I love the fact that you can drag and drop any phrase (such as a song title or performer's name) from anywhere to the search box, and it automatically searches. Then, too, if you've got the "highlight" feature turned on, it highlights the word or phrase you were searching for in whatever page you're looking at.

If you do a lot of searching, as I do, the Google toolbar is wonderfully useful.