I got a fun one for ya. I picked this up with some b'day cash this last weekend at Target for $50. 20 in 1 Coleco Handheld Electronic Games, and it's basically the same depth as a DS Lite, just as wide too but in the other direction just as long as that bit if you remove the hinge area. Runs off 3 AAA batteries, has great speakers (2), a DC jack, A/V cable for the TV, and a very very high quality LCD that doesn't blur and is very sharp (better than GB Micro screen.)
It's basically a portable SMS/GG game selection and it has the following 8bit gems.
-- Includes: Alex Kidd in High Tech World, Alex Kidd in Miracle World, Altered Beast, Assault City, Astro Warrior, Aztec Adventure, Bomber Raid, Columns, Ecco Tides of Time, Fantasy Zone, Fantasy Zone The Maze, Global Defense, Kung Fu Kid, Penguin Land, Quartet, Snail Maze, Sonic Drift 2, Sonic Triple Trouble, Super Columns, The Ninja.
I intend to give these a fun run. I'm slowly getting addicted to these different gems of the era I was deprived of as I got the NES for christmas instead and well history from there. ;)
I feel I may just have to research the sucker and see how much damage it would cost to get one and some fun games for it down the line. I read that EU games work in the USA one oddly enough (system doesn't seem to care about pal/ntsc at all which is odd.)