Well WWDC is over and the dust is settling. I've gotta say I'm really liking the looks of Leopard; I love the cover flow in the new finder and the quick look feature. Why is it Apple always have really great ideas; which with hindsight seem so obvious :). e.g. the two fingers on the touchpad for 2D scrollwheel thing? Or the iPhone user interface with your fingers. Or the iPod music quiz game (if you've got an iPod, you have played that game right? Cool & addictive eh?)
Stacks looks cute (I like the eye candy of the reflections in the dock :). Spaces is welcome but no biggie as there are a number of alternatives that have been around a while now. Time Machine is awesome (ZFS really) and can't wait for that. And the new iChat looks fun :). Don't really care about Mac.Mail changes as I try and use gmail for all mail now. I wonder how much other Core Animations stuff will creap in...
I did kinda wonder if Leopard would have more native virtualization for out of the box support for Linux & Windows (X is already supported nicely); with maybe Parallels being integrated into Leopard; but I guess with Parallels and VMWare, its best to keep healthy competition in that space
The choice of using Ajax for the iPhone is great news; anyone can now develop applications for the iPhone in a standards based way that'll work on other platforms & browsers. (I was a tad worried it was gonna be Cocoa / XCode stuff for the iPhone :). Its also good to hear that the iPhone isn't gonna be locked down per se; anyone can write applications for the iPhone.
The other nice thing is now we have a single, fast browser (WebKit/Safari) that runs on the iPhone, Mac and Windows. See Joe's comments via Dion. If the iPhone takes off, especially with alpha-geeks; I wonder how many enterprises will start writing their intranet apps for the iPhone, Mac, & Windows; i.e. picking Safari as their standard supported browser instead of the usual FireFox (or IE for windows-only places).
I wonder how many windows users will actually explicitly choose to use use Safari on the Mac. I guess its used in iTunes anyway, so there's really lots of Safari (or rather WebKit) users already; so Apple might as well make it available. I wonder if Apple will release iLife for Windows as well?
Still its hard for WWDC to be as cool & exciting as the iPhone stuff; I suspect its gonna be increasingly hard for Apple to get us excited about the next OS X when often the really cool stuff is gonna be the non-PC stuff (phone, TV, remotes, tablets etc). e.g. have you seen the new ads? Amazing aren't they; especially the calamari one; I love the lovely google maps integration :).
Only 2 weeks to go to the US iPhone launch; can't wait for the european launch now! Hopefully they'll have fixed the few glitches in the early iPhones by then :)