I recently discovered a strange, REALLY under the radar chinese handheld called the Dingoo A320. Here's the Wiki article on it:
http://en.wikipedia.org/wiki/DingooWhy should you care? Well, how does a handheld with a gloriously bright, clear screen that gets upwards of 12 hours battery charge, comes built in with emulators for the NES, GBA, Genesis (which is spotty), SNES, Neo Geo(!) and (drum roll please) both Capcom CPS1 and CPS2 arcade games out of the box. It's got a built in 4 gigs of flash memory, an SD card slot that supports 16 gigs, plays most movie formats, doubles as an mp3 player, and has the build quality of a Nintendo DS (in fact, many of the buttons and pads *are* DS). Pretty neat, no? It's about the size of a GBA micro too. It has several (free) games included, including a couple of 3d games that look better (for real) than most DS 3d games, including a kick ass silent hill type game (also free).
If all of that doesn't interest you, then this will:
It retails for $70.
That's right peeps, you get all that for the price of a 360 game. I've fallen in love with mine. It's a wonderful piece of hardware, and it's so cheap anyone should be able to get one. There are currently emulators being developed (by the fan community) for the Gameboy, Wonderswan, Tg-16/PCE (happy dance!), Mame, SMS, Game Gear, and a few others. It's an amazing system that's rapidly developing a support base. I cannot gush enough about this little gem of a system. Nothing beats running around town with a sexy little black handheld on which I have several hundren NES games, and most of the library of Neo Geo and Capcom games. Dungeon's and Dragons Tower of Doom makes for one AWESOME handheld experience. So does Metal Slug and KoF.
Now, the down side. Currently, the Genesis emulator is very poor, and the SNES is somewhat picky on certain games. Both of these are being fixed/replaced by the community. The Neo Geo emulation is quite good, but it requires the ROMs to be in .MVS format (not a zipped collection of BIN files). This works fine, and there is a free converter, but the converter needs the newer romsets, so it may take a couple different downloads (or you could just ask me O:) :-").
So, if you are even remotely interested in portable classic gaming, this Dingoo thing is the greatest thing since the Turbo express. Get it at Deal Extreme:
http://www.dealextreme.com/products.dx/category.609