If you've got some extra time, sit down this weekend and listen to this excellent lecture by Ian MacKaye given in the form of a Q&A session for the music business students at Loyola University.
Don't get discouraged when you hear the annoying first question, "Why straight edge?". Ian seems as annoyed by that question as I was, but he gives a very thoughtful answer and moves on.
The rest of the questions focus mainly on the history of the various bands he has been part of and the DIY mentality and work ethic that he and Dischord records are famous for. He's got some great stories about the sordid business tactics of the music industry (Ticketmaster specifically) that would make even the most chipper idealist cry. I'm not exactly sure when this was filmed, but it must have been a few years back because he also questions the validity of, and correctly predicts the demise of Myspace as a springboard for new bands.