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My friend recently got a Sunbook, which he loves to use outdoors: http://www.cloversystems.com/SunBook.htm (their website is horrific, but the product is decent).

It's essentially a netbook with a special screen that can can work in both daylight and indoor light. In the sun, most of the colors wash away and it becomes a mostly black&white screen. But you can read it perfectly easily (similar to eink, but I don't think it actually uses eink, despite what their PR claims).

http://www.mirasoldisplays.com/ Interferometric Modulator MEMS screens are about to enter mass production.

A related patent: sun-lit screens: http://www.crunchgear.com/2010/03/25/apple-patent-watch-sun-...