Apple, today is attempting to rectify the problems associated with the Dual-link DVI adapter and 30-inch screens that have been plaguing new MacBook/AIR/Pro owners (including myself) since we received our devices (2 months late). And some other stuff. Hit software update and report any and all snappieness™.
This update improves cursor movement when using the Apple Mini DisplayPort to Dual-Link DVI adapter with the Mini DisplayPort enabled MacBook Air, MacBook and MacBook Pro. It also improves playback of HD video running on systems with NVIDIA GeForce 7300 GT or GeForce 9600M graphics.