Wonderswan is the handheld console of lame name but GREAT games. I am teh proud owner of one, the games are really brilliant, and its the lightest, most economic handheld ever done (runs 20 hours on one AA, and it costs only 65 dollars). The best thing is that most of its gaems are exclusive to teh machine, no lousy ports or stuff, just games done for Wonderswan only
I'd recommend emulation of it, specially for a game like Guilty Gear Petit, since the Wonderswan's controls are not too good for playing fighters (even with teh included WonderCoin accessory it still sucks). For other games, it rocks. I have to get Mr. Driller!