They have a beta version out... for both Mac and PCs, so you PC-users can't get all grumpy about not being able to be in on the next cool thing. And best of all... you can download it for free!
So here are a couple of the things that I think are really cool (maybe flashy, but hey, they are cool!):
When you open up Safari, it opens all your "top sites" (the ones you visit most often?) in the background, and you can see them in this really cool gallery.
Then you can just click on the site you want to open.
Supposedly, you can also view your bookmarks this way. I haven't had time (surprised?) to try this out yet. (Or many of the 150 features.)
Anyway, I'm sold.
I think I've posted this before, but here it is again: