I found this great kids’ site called Soup Toys, and its genius. You get a free little app that lets you choose from thousands of playsets or create your own.
The toys spill out on your screen and you ‘play’ with them as you would in real life – balls bounce and make ball bouncing sounds, etc.
It’s a community-based endeavour, so people create and upload new toysets all the time. There’s now 24018 of ‘em, and it really is ace. If you can stop playing with it yourself long enough, your kids will love it!
Sadly, no Mac version yet.