I used a Canon 20D with a 17-85mm lens for this shot. Here's the exposure settings:
Exposure: 17 min, f/10.0, ISO 400
Usually, any time over 30 seconds will start to show the star movement. I like around 20 min or more for a nice star trail effect. Night photography is a fun challenge!
Just a simple headlight. I try to keep my gear pretty non-technical. Usually, I end up using a rock for a tripod....
If you are interested in the exposure times and a little bit of detail on good settings to use, I provide a short discussion on my webpage:
A lot of really nice shots and tips there. Thanks for the link.