Safari 4 beta FEB 24 2009
It's supposed to be really fast. Check it out here.
Update: The new location for the tabs is pretty disorienting so far. (So far = 10 minutes of use.) I keep glancing up in the middle to see the title of the page I'm on and it's not there...and then I have to hunt for whichever tab I'm on. The separation of the tabs from the page content is also causing me problems. The page area is What I'm Looking At Now and the tabs are What I'm Going To Look At Soon...why separate them with a bunch of stuff (aside from the URL) that is unrelated to either of those things...i.e. What I Almost Never Need To Look At?