Omega Five. The Natsume-developed side-scrolling shump hit XBLA (pictured) in early 2008 and has since shot into obscurity. According to Famitsu, the game is set to appear on Nintendo 3DS in Japan during Spring 2011 -- where it'll probably make a more memorable bow among a launch lineup otherwise devoid of "traditional" shoot-em-ups.
Hudson published Omega Five on XBLA. The company hasn't made a peep about the 3DS version, but we'll check in to see what -- if anything -- it has to say about a possible North American release.