Added some initial code in the nightly builds to implement the native OS X 10.7+ fullscreen mode API. This allows the game to get its own workspace.
You can switch to/from fullscreen mode via the OS X gui button in the window title, once the LWJGL fullscreen mode api switch is enabled.

Toggling to/from native fullscreen via Display.setFullscreen() and Display.isFullscreen() isn't implemented yet (not sure whether to go down that route yet as the normal fullscreen uses the DisplayMode and this just uses the current desktop resolution).
The fullscreen mode API can be enabled using the org.lwjgl.opengl.Display.enableOSXFullscreenModeAPI switch:
e.g. as a VM parameter using:
-Dorg.lwjgl.opengl.Display.enableOSXFullscreenModeAPI=true
or in java code before creating the Display:
System.setProperty("org.lwjgl.opengl.Display.enableOSXFullscreenModeAPI", "true");
Anyone up for testing this feature you can do so using the
latest LWJGL nightly builds.