Unfortunately, there aren't many of those guys left. The Cardinals have seen nearly a dozen prospects make their major league debuts this season--including some very clutch performances--and McClellan, Pérez, Mather, Stavinoha, and Phelps are currently on the 25-man roster.
Players who have been up and are on the 40-man roster:
Players who are on the 40-man roster but have not seen ML action:Mitchell Boggs
Jaime García
Mark Worrell
Mike Parisi (thhhhbbbbpppppt.)
Brendan Ryan (MLB debut 2007)
Rico Washington
Kelvin Jimenez (MLB debut 2007)
Randy Flores (MLB debut 2002)
There are also four spots on the 40-man roster currently occupied by DLers (Duncan, Carp, Barton, and Izzy).Jason Motte
Jarrett Hoffpauir
Blake Hawksworth
I'd love to see guys like Brian Barden and Cody Haerther get the chance to show off their stuff, but we'll have to wait and see what Tony thinks about that.
Am I a staunch supporter of the September roster expansion? No.
Will I live with it because it's not going anywhere? Sure.
Do I believe it is as evil as the DH? Not necessarily.
Do the pros outweigh the cons? It's entirely possible.
Does anybody really care what I think? Chances are slim.