S.G.
My 4yr old son got one for Christmas too and he plays with it non stop!!! He got Toy Story, Mr. Pencil (seems to be a favorite), UP and Xmen which he loves!!! I also got some of the Leapet codes and downloaded a book and a train game for him too. I know some of the regular games you can add on to them with the leapets too. We just recently got him a case for it from Wally world for 15 bucks (the only had the leapster 2 for a while) and the charging base is great so you aren't eating AA batteries!! I think I might get him Penguins of Madagascar the next time I someone has the games on sale.
S.