Sorry for the late response. Work has been very busy with E3 and all, I haven't had time to listen to Darius' track or even play Alien Swarm... Not that I know what that is.
About the remix status, that should be it for this installment. Thanks to everyone for their requests and feedback. While I didn't get to them all, I had to prioritize given the time allowed and I was able to complete all of the original Freespace tracks before I moved back to Chicago - so it's just a matter of time before they find their way into the main game build. There are a total of 109 new tracks for Freespace alone.
I'm also planning to distribute all the tracks on soundcloud some day soon, but have yet to come up with a plan for how to go about it. I'll ping this newsgroup if and when I get to that.
Thanks again to everyone! Feel free to contact me if you have any questions about getting this stuff working.