Well, I haven't explored a lot of MAME on GP2X yet, but I know that Aero Fighters, 1942, 1943 and Time Pilot work. I have been enjoying the Neo Geo shooter library, though; with GNGeo2X you can get Strikers 1945 Plus, View Point, Captain Tomaday, Ghost Pilots, Last Resort, Zed Blade and Sonic Wings I, II and III running, not to mention all the Metal Slugs. In fact, I've yet to run across a Neo Geo game I couldn't get running with a little effort, and there lots of great shooters on the Neo Geo...