Gekko got his hands on a lot of stuff before it came out.
Puma, 10.1. Office v.X, Photoshop 7.0 (before it was announced, go figure), numerous Safari builds, Keynote, Final Cut Express, Panther, Tiger, QuickTime builds.
Came back to bite me in the ass a couple times.
Here's a screenshot, notice a few changes. Got the dashboard open (F12), calculator on there, world clocks, the sweet tile game, address book, calendar, stickies, and iTunes. I got the options for Stickies and world clock open to see. the real calcuator has a new programmer mode, which I opened up. Don't ask me what it means.
Quicktime is 6.6, slight visual changes are noticeable in my PSU trailer
Preview now has a fit to window option when viewing images. The search is open up, and MY GOD IS IT FAST! Literally if I were to type Gamecube, it would be done within 3 seconds, and this is an old Mac (733 G4).
iChat seems the same, because I don't have 3-way video capabilities. And Safari, my lovely Safari. w00t! RSS feeds
Also has private browsing, to not log anything in your history or accept cookies. pr0n! Only other thing I noticed, it has mail the contents, and mail link to this page options.
Tiger > Panther > Jaguar > Puma > Longhorn
I was nice, I said longhorn over the old, slower than hell 10.0... only because of the speed.
If you want to download the 1.6GB, and got a place to install it, let me know. I can get you Tiger.
Now, I must go find a way to get a incorporate RSS feeds into vBulletin. Mwahahahahaha!