The new version of Safari has some pretty awesome features! The back and forward buttons really work nicely - they save a snapshot of each page in its final state right before you leave it, and when you swipe left or right on a trackpad or Magic Mouse, they slide in the snapshot with no reload or delay. Only if you stay on that page for a second or two does the page reload itself.

This makes it easy to swipe back and forth to find something in your browser history. Very handy feature.