So I'm watching the demo today and the thing that strikes me about full screen apps (I'm expecting a full screen Mail app like the iPad, full screen calendar, full screen Safari etc. etc.) is that you are kind of separated from what else is going on on your Mac (bouncing dock icons, windows in the background etc.). I realize that Mission ContrLOL is there to allow you to move between apps easily but if I'm in full screen Safari or iPhoto and I get a new email, I don't want to have to multi touch my way over to Mail to see what that email is. I'm thinking that Apple are developing a Growl-esque notification system, not only for iOS devices but also OS X Lion. If so, this makes even more sense.