Dan Moren, Macworld:

The white polycarbonate MacBook, first introduced in October of last year, now gains a 2.4GHz Intel Core 2 Duo processor, up from the 2.26GHz chip it debuted with. In addition, it now sports an Nvidia GeForce 320M graphics chip—the same available in the latest 13-inch MacBook Pro—instead of the previous Nvidia GeForce 9400M, and Apple is boasting that the MacBook’s battery life now stretches to ten hours, up from seven.