WWT == Wow
The World Wide Telescope (WWT) is amazing - I can't wait to show my son. You can see a demo of it from TED here. I'm not sure when this will be available but I hope its soon. This is a great application of the Deep Zoom effect.
BTW - if you're an astronomer wannabe like myself I highly recommend APOD's desktop of the day tool (I've been using it for years).