The... GameCube... doesn't... use carts. By "carts" you mean catridges, right? It uses those tiny CD's. Unless those tiny CD's are called carts?
I'm not looking forward to PSP and DS seems like junk. Why? Because when I'm on the road I entertain myself by reading, and when I'm not on the road and I want to play videogames, I have this awesome thing called a PS2 that has kajillionz of games for it. Plus, if I want to send e-mail or chat with my friends, I have this thing called a computer.