USB monitors make working on the road with a dual-monitor setup possible. The Mimo 720 F (via Akihabara News is a 7” touchscreen display with a resolution of 800 x 480. It offers a 400:1 contrast ratio and 350cd/m2 brightness. It uses a single USB cord for power and data, and is VESA 75 compatible (it comes with a 75 x 75 mm mounting hole pattern).
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The Mimo works in landscape or portrait mode, and supports XP, Vista, and Intel-based Macs (32 bit only). It is available online for $200.