finally a solid emulator with netplay for CPS3 has been released.
(MAME sucked performance wise + its interface is horrible)

1. nFBA emulator with p2p support
2. Street Fighter III 3rd Strike (Japan NOCD) or any other game really :)

Game -> Set dipswitches - change localization to US
Game -> Map game inputs - set controls
Game -> Play via Kaillera - play peer2peer with a friend
FAQ & movelist here

1, 2, 3

Daigo vs Justin Wong
http://www.youtube.com/watch?v=pS5peqApgUA

go pro.