After installing, place your MAME-titled zipped roms in /sdcard/ROMs/MAME4all/roms folder.
MAME4droid uses only MAME4droid & iMAME4all uses only '0.37b5', 'GP2X, WIZ 0.37b11 mame romset'. Use "clrmame.dat" file included in /sdcard/ROMs/MAME4all/ to convert romsets from other MAME versions to the ones used by this version, using ClrMAME Pro utility, available in this URL:
http://mamedev.emulab.it/clrmamepro/
MAME4droid will never have "save states" since it is based on a MAME version that does not support it.
Official web page for news, source code & additional information:
[URL="http://code.google.com/p/imame4all/"]http://code.google.com/p/imame4all/[/URL]