Just looking at the GP2X Wix - At $180 it's not a bad priced open source handheld gaming machine, touch screen and what is basically a dual d-pad set up, this could lead to some interesting projects.
There is also the Pandora, which does look promising, but far to clunky I think to take off.
Another alternative is the Dingoo A-320 but this looks even less appealing as a device.
Ultimately, this is a great arena for home game makers to get some easy exposure, release something fun that'll get you possibly noticed, it will even play flash games as well as be a emulator so you can get some of those old home brew projects you wanted to make out there on this platform. The makers are also launching a digital online store similar to Apple's, which would allow you to sell your creations if you didn't want them released as freeware, which could be a nice bonus feature for anyone who might have released a game on any other platform.