The Sharp Aquos 15L1U features built-in Wi-Fi, battery, but runs a cool $1,600 for flat-screen, luggable perfection: David Pogue reviews the high points of the Sharp unit in the New York Times, noting that it's a jaw-dropping product which executes quite well on all of its selling points. It weighs 11 pounds, and can transfer video without a hitch even as you carry it around a house.
But you have to rewire your home video system, deal with delays in remote controls, and cope with a 1 hour, 45 minute battery life. It can be easily plugged in, however, to both power and a direct video connection. Pogue also found that the unit functions best within 35 feet, not the 50 feet in the manual or 100 feet in the marketing literature.
It also, unforgivably, uses 802.11b (11 Mbps), not 802.11a or g (54 Mbps). 802.11a might seem like a bad choice except that the unit comes with a dedicated base station and receiver; it doesn't work over an existing wireless network. The base station also has the infrared and video adapters.