The upcoming Lenovo LaVie Z machines will weigh 1.7 lbs but be in a bulkier (tough) Magnesium-alloy case. Not sure if they'll have enough RAM, hd-storage, or battery-life for many, although if they're that light I'd probably be happy to carry an ac-adapter around for periodic charging: http://news.lenovo.com/images/20034/Lenovo%20LaVie%20Z%20Spe...