Apple CEO Steve Jobs announces changes to MacBook Pro, MacBook and MacBook Air laptops at Apple's headquarters in California. Faster graphics with Nvidia chips, new aluminum cases, and improved trackpads are some of the features Apple will offer in the notebook line refresh. All will use a common core graphics chipset, the Nvidia GeForce 9400M. Some of the other changes, like the aluminum cases and upgraded touchpads, won't be featured on all models.

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