Lock Me is a simple status bar application that allows you to lock your screen.
I wrote this app to get familiar with Xcode 4, since the handling is quite different to Xcode 3. Anyway, it is a simple app and can do only one thing: lock your screen.
There are 3 global shortcut options:
As a gimmick, you can choose the color of the icon which is shown in the status bar...
...but even better than that - it's FREE!