One of the things I love about Google Chrome and Firefox is the ability to do Google searches using the address bar, rather than being forced to have valuable space taken up with a separate search box in the toolbar. It’s one of those few relatively minor things that kept me from using Safari for quite a while.
Apparently I wasn’t alone, because a developer has recently released SafariOmnibar (direct download) for Safari for Snow Leopard and Lion. Run the Package installer and you’re good to go. As you can see in the image above, you’ll have the convenience of a single address/search bar.