So many PS1 games, and it's gonna be difficult to keep track of which memory card (on PS3) has the game's save. So here's a feature I personally would like to see in multiMAN... Don't know if it's even possible, but it would be cool.
When you insert a PS1 CD, it will check the ID and create a memory card save just for THAT game. So basically each game would have it's own memory card file. This way you'd never have to worry about which card has your saved game.