Oh wow. I love that. Makes me wish I didn't keep my dock hidden. I love the frosted glass look and blurred reflections and rounded corners. Apple's been all about rounded rectangles ever since they invented them for the original Macintosh OS in 1983. I'm surprised they haven't brought back the rounded menubar.
I can't wait for Mountain Lion. I am very excited for all the iCloud and iOS integration. Namely reminders, messages, and NC. I just got an iPhone 4S and use all of Apple's apps and can't wait for more apps to use iCloud.
I also hear Growl is going to make a "style" that simply sends messages to NC so all apps that don't use NC can still have notifications. Which is awesome.
I don't use Safari though, I use Chrome, which has its own syncing feature. I can't even consider going back to Safari even if I wanted to because ever since last years iOS 5 beta, my bookmarks have been so fucked up. And the problem isn't local. It's a corrupted database on the server itself. I literally tried deleting Safari's cache and settings from my Mac, turning off bookmarks syncing on my iOS devices and starting over. It always downloads a broken database full of duplicates. Thankfully Chrome works great.
I wish iCloud worked like Dropbox in that it was a local folder that was synced automatically and immediately upon changes. It makes no sense that it doesn't. That way you'd still have a local copy, but have it available everywhere too.
I am also really disappointed Apple didn't integrate Siri into OS X to replace the aging voice recognition system that's been in the OS since OS 9 or so. It only makes sense. It would make the computer even more into the future, and with a computer version they could have an activation phrase that would let you not need to use a key. Maybe in 10.9 next summer when Siri is more mature on iOS.