Anyone here try it?

 I still am waiting for Google Chrome for Macs.

You can download Safari 4 Beta right now. It's got a new Javascript engine—called Nitro—that 4.2x faster than Safari 3. Feature-wise, it pulls a lot from Chrome and Firefox it looks like:

...

http://i.gizmodo.com/5159260/apple-safari-4-beta-available-now-top-sites-cover-flow-and-nitro