I noticed the Safari 3 download available and thought I'd give it a shot. I generally use FireFox on my iMAC but my wife uses Safari. I've only been using it for a few minutes but the speed of pages loading is awesome. Not sure what they did to make it fast(as they claim 2x faster on the download page). It's lightning fast so far.
Go get it as it's an easy download and available for PC now too.