Just poking around the internet, I see that Google is providing an "early release" of the Chrome browser for Mac OS X. They have several warnings about privacy concerns, but if you'd like to see what's coming, it might be worth a look. I just took it for a spin, and while it seems pretty basic, it didn't crash, and it seems pretty quick.
The "tabs on the top" approach is preferred by both Chrome and Apple's Safari 4. This does give the UI a slightly cleaner feel, but it seems a little awkward to click and grab a tab at the top of a window to move the browser.