i use Mountain Lion GM, and it supports airplay to apple tv. what a neat trick i found when airplaying my 11" air to my full HD tv via Apple TV was the screen on my air looks like it has 1920x1080 resolution. text a little bit fuzzy, but not that bad.. the best thing is when you are working with photoshop or adobe illustrator, your work art still looks sharp! so it's like having a 1920x1080 in your air. it's really convenience to work with, but don't try to read websites with it because it will make u dizzy. sorry for my bad english.. here's the pic, notice how much workspace i got in my air. note: why did my pic became rotated? i put it in dropbox.