S.R.
Another one to check out is Starfall, my kids enjoyed playing around on there at that age. I didn't even pay the $10 (or whatever it is) to access everything, they just played on what they could access and were content with that.
I didn't expect them to truly learn anything from it... I just liked having a diversionary option for them that was mildly educational. Like letting them watch SuperWhy or WordWorld.