Hard choice.
MacIntosh definately gets a prime vote.
But I'd say the Aluminum MacBook & current MacBook Pro Aluminums (TiBook's get small mention).
reasons:
1st laptop under 6lbs = TiBook.
1st laptop under 1" = TiBook.
First Unibody laptop = MacBook Aluminum Unibody.
First environmentally conciously made laptop = MacBook Aluminum Unibody & Current Pro's.
THAT my friends is revolutionary, changes the industry not just the company , and further helps the environment, while helping sales and reducing shipping costs due to more volumes being shipped in each shipment.