My son and nephews are literally obsessed with the show Cars. When Planes came out, we went to it the opening day. It was cute and funny.
We ended up getting the game for the wii. I love it because for a 4 year old, who only KNOWS about the wii from his older cousins, he can actually play it. There is a training mode where you can just fly the plane around and learn how to move and play the game.
For anyone with boys around the ages of 3-10 I think some great gift ideas (hint, hint, grandparents) would be: