Travis doesn't think much of the new Safari (version 4):

I tried the Safari 4 beta preview for about a week now. I hate it. So, I've made the switch.

I hadn't paid much attention - I normally use Firefox on my MBP. My daughter updated Safari on the iMac though, and wow - the placement of the tabs is just stupid. By putting them on the window pane, it virtually ensures that you'll end up in an unexpected place every time you select the window.