Apple released a graphics card update for its portable line, as well as other Macs:
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.
You can download the update here.
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sadly nothing is fixed with this update. when changing the graphics card to “high performance” an external apple 30″ monitor display is not even recognised. when changing back to “better battery life” the display is recognized sometimes but only renders highly distorted images. tested with two current macbook pros 15″ 2.8ghz and two different mini display port to dual link dvi adapters on two different 30″ apple cinema displays. apple should recall this adapters!
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