V.E.
My son ,who is 4, has the Leapster and loves it! They have games that range from 4-9 years old. I like that the pen is attached so he can't loose it or drop it in the car (then no one can reach it). Go to leapfrog.com because they have sales on them for the holidays.
The DS is coming out with little kid games now but I would worry about the little pen getting lost.