iMAME4all is a iOS universal app done by David Valdeita (Seleuco), port of MAME 0.37b5 emulator by Nicola Salmoria & TEAM for all iOS devices (iPad HD, iPhone 4G , iPod touch and older) and it is based on GP2X, WIZ MAME4ALL 2.5 by Franxis.

MAME4iOS 1.5. Added new native l2cap bluetooth support for up to 4 PS3 Sixaxis (or WiiMote) controllers (you must store the Bluetooth address of your iOS device in your controller with a 3rd party utility like SixaxisPairTool). Added touch button and touch stick size selectors. Fixed permissions errors when creating files on jailbroken devices. Bluetooth manager bug fixes.

Download Both versions here --> http://code.google.com/p/imame4all/downloads/list