The next version of this mod is going to be released at around 4 pacific over Steam today (Friday the 6th). It's an HL2 space combat mod and it is absolutely awesome. Everyone needs to give it a shot. It reminds me of space combat in battlestar galactica or star wars. Just be warned it has a bit of a learning curve, but nothing as bad as ESF.
http://www.eternal-silence.net/index.php
http://www.eternal-silence.net/index.php