Take a look at World Wide Telescope from Microsoft research. its still in infancy, but there are already some pretty cool guided tours, even just browsing the galaxy is fun-- you can zoom in and pan tilt / turn the planets... It looks great on 1080p large screen TV. I always imagine sharing this kind of thing with students and have them explore it... but I'm not a teacher, but my kids and I play with it. It also orients the horizons according to your location
http://www.worldwidetelescope.org/Home.aspx