Apple's new MacBook and MacBook Pro feature precision unibody enclosures milled from an extruded block of aluminum, allowing them to get even thinner while retaining rigid durability and a stronger, cleaner, and more polished design. In a press release touting the new manufacturing process, Steve Jobs said, “Apple has invented a whole new way of building notebooks from a single block of aluminum (video).”

More info: Illustrated overview with photos