|Is it kind of sad that I stopped wearing button-down shirts as often out of fear of being X-collar choked in public?|
Excellent reference video for Gi Chokes from ShogunHQ - http://www.shogunhq.com/2010/08/gi-chokes-reference-video.html
While not exactly done in a explained step-by-step way, he really does a good job showing his moves in a deliberate, slow way. So, rather than an instructional video in its own right, it's something you can come back to and watch on occasion to glean an additional detail or two on different choke setups from his personal BJJ gameplan.
Great video, and I do like the music with it.