@dxw00d, Maybe im of the wrong generation, younger developers will be into xbox and ps3's, Im 42 so have grown up with Nintendo's in all forms and so have my kids so i have ended up with their offcast's SP's NDS's & NDSL's, I like Gameboys because the hardwares all there for you in a neat little folding case, all that is needed is a flash cartridge which i also have.
I've had various development platforms over time and i've looked at RPi and can't justify the cost when it will just end up as a paperweight.
If it comes down to it I also have a wireless IP cam which also uses ARM and runs Linux, so we're surrounded by re-useable hardware with is either free or very cheap
@dxw00d, yes an old DS can be picked up for about the same off ebay, the bonus is it already comes with 2 lcd's, wifi, spi, 16bit data bus, buttons, battery, charger and a tidy case