Just a word of warning for those interested in the new aluminum MacBook: The lower end model does not include a backlit keyboard.
This is a disappointment. Besides the new trackpad, the one very enticing feature of the new design is the backlit keyboard. Hopefully the next iteration of the AluMacBook will include the illuminated keyboard.
Who knows... Maybe by that time Apple will also add FireWire-over-Ethernet support to the MacBooks. That's unlikely though.
The Apple Store is very misleading. Although Apple's website confirms in multiple places that the low end 2.0 GHz aluminum MacBook does not include a backlit keyboard, the Apple Store order page says it does.