I know this recommendation isn't strictly an ultrabook either, but it does offer most of the benefits of an ultrabook without all the compromises. The Thinkpad X220 is super-performant, has an amazing battery life, all the durability and reliability of a Thinkpad, and the best laptop keyboard on the market. It runs Ubuntu like a charm and recognizes all the hardware (except maybe the finger-print reader) and it weighs in at less than 3 lbs. Sure it is a little thicker than the ultrabook spec, but why would you want to marry a skinny little super-model? That Ultrabook may look sexy now, but trust me - the Thinkpad X220 is the laptop you'll want to settle down with. Don't forget to get a big fat monitor for the office.

Allegra loves hers.

Dell just announced their upcoming XPS 13 ultrabook, their latest MacBook Air competitor. Not sure when it will be released, though.