I love the Sesame Street Games...I think they are the best for preschoolers.
They teach important concepts, at the same time, making computer skills real easy. For eg, there is no "click and drag"...that's hard for them...there's "click" "move" "click".
There are some games Ian really likes...(click on photo for the games)That's the Wheels on the Bus song (you press the keys foe interactive movements)Patterns. Seasons. Fun for the kids. This is alltime favorite. First you make a pitcher of lemonade. Then depending on how many monsters come, you click however many cups. I love it!