Just thought I would share this:
http://space.jpl.nasa.gov/
It's virtual plane-arium. An essential star-gazing accessory, I'm sure you'll agree.
Edit: This is much, much cooler. Thanks to debaser.
http://www.shatters.net/celestia/
Pretend you're on the Starship Enterprise and fly around the galxy in real time (or faster if you're in a rush)