http://www.techcrunch.com/2009/05/12/googles-skymap-a-virtual-viewfinder-for-the-stars/

I remember seeing a demo of something very similar to this about 4 years ago...on a particularly unwieldy tablet PC. This should be a lot easier on the arms! Application is from Google, a 20% project.

Via TechCrunch, new Android app. called SkyMap

http://www.techcrunch.com/2009/05/12/googles-skymap-a-virtual-viewfinder-for-the-stars/