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Check out the laptop offerings from System76. They offer two netbooks and a 14" 'ultrathin' model. http://www.system76.com/index.php?cPath=28

Any idea what the battery life is like on the 14" ultrathin?

The consensus in the support forums seems to be that it's about 3-5 hours:

There are forum posts with people reporting two hours or less, but these may have a defective battery (a company rep offered to replace it):