Trojan. No surprise, it was a matter of time. It starts with an email to try to get you to a porn site, when you click on a video it tells you that you don't have the proper codec and gives you the opportunity to download it. Classic social engineering. And apparently very good engineering of the trojan, also. (Slashdot thread)

Leopard Bugs. Again, no surprises. Which is why I'm waiting at least a couple of weeks to install it until a lot of the early bugs are stomped on.

I've seen lots of reviews/previews, but none really discussed the features.

http://www.wired.com/software/softwarereviews/news/2007/06/leopard_review?currentPage=1