Full screen apps
I think full screen apps will be one of the unsung heroes of Lion. I’ve used them more and more, even on my 27” iMac, and while there are some apps that might be useful on smaller screens but less so on a 27” display (Safari, Mail, etc.), there are other things that just seem born to make full use of the display regardless of what size it is (iPhoto, iTunes, etc.).
Another big one is Logic. I’ve run Lion since it was available, and the one app I’ve hoped would integrate full screen support has been Logic. Somehow, without me noticing, that little full screen button appeared in the upper right of my Logic window (it must have been Logic 9.1.4). I’ve used it in full screen mode and it’s exactly what I’ve always dreamt of. On a 27” display, it’s just perfect. Flipping back and forth between my normal desktop and Logic is really what I’ve always wanted, and I had a jury-rigged solution on Leopard and Snow Leopard to do this (a dedicated Space for Logic). Now the time has come where I can truly give Logic its own fully dedicated workspace, and it’s better for focusing and remaining “in the zone.”