One of my two current WIPs is a space opera, and the travelling has gotten a little out of hand. I needed to visualize where everyone had been, so I put together a stellarium app. Worked out better than I hoped, and I'm actually kind of geeked out over it. Here's a clip captured from it. Unfortunately, youtube really trashes the detail, so you have to watch it fullscreen to even hope to read the labels.
http://youtu.be/mPmmgv6rEnE
http://youtu.be/mPmmgv6rEnE