Well, clearly a flashcart firmware question hardly equates to a rom hacking topic, anyway:
http://gbatemp.net/index.php?showtopic=193749
M3Sakura can only play multimedia, not commercial roms, ie. Moonshell replacement option
The others mentioned, including DSCovered (DSision 3) found in homebrew section, all basically use YSMenu. You will also find a thread on getting Moonshell to play roms on the R4DS - it's gui is very similar to M3Sakura.
Menudo = Menudon't
Better prepare yourself for the apocalypse, that's coming before any Menudo release.