Today we released Displaperture 1.2, our free utility to round the corners of your screen. New in this version is support for multi-monitor Macs—you can choose to round the corners on all attached displays, or (the default) just the one with the menu bar. Displaperture now works with Exposé, too, so you won’t lose your nice rounded corners when you activate Exposé.
Finally, for you developers out there, Displaperture is now open source—you can download the source code, and use it as you wish.
I’ve been using this small utility for more than a year. Great App!!!