The PS3 Slim wasn't much lighter than the previous model, but that hasn't stopped crafty Japanese manufacturer Hori from cobbling together a portable PS3 Slim with a 720p LCD screen.
You could buy the $15 Xbox Live Arcade game Virtual On: Oratorio Tangram and play it with a regular controller. Or you could cowboy the fuck up and buy Hori's $323 dual joystick controller designed specifically for Virtual On.
Street Fighter II Turbo HD Remix addicts, pay attention: Hori's Real Arcade Pro EX SE arcade stick is as solid a controller as you'll find for the Xbox 360, but it'll cost you.
Hori's relatively giant, 12-inch, 720p LCD docks with your XBox, bringing it half way towards being tote worthy. I especially appreciate the fact that the screen is essentially the same width and length as the console's side.