I have been following this project at Microsoft for a while now, and I thought others might find it sort of cool also.
http://www.worldwidetelescope.org/

It requires a 20 meg download, but I think it is worth it. The guided tours are neat, and the contextual information available is neat. I just killed a couple of hours screwing around with this, just so I could show off to my son a little.

I agree Groovicus.

Downloaded it a couple of nights ago and bingo, 2 - 3 hours gone west.
It is certainly quite impressive.

Cheers

That is just excellent thanks Groovicus.