Sorry, thought I put some detail in a previous post, but I guess I didn't! Bottom line is that the shock was defective when it came from Icon (or so they think). The shock mount is assembled at Icon and comes to the customer with the lower bushing attached to the shock body. Apparently, when Icon assembled mine they might have left a hairline gap in the threading (i.e. the threads were not 100% seated, and were probably 99.9% seated). So, after a few thousand miles and pushing the suspension this past week they eventually stripped and worked loose. I'm apparently pretty famous because everyone seems to know me around here without actually knowing me ("Oh, YOU'RE the guy that lost his shock!").
+1 more for Icon: I mentioned I was going to Moab after this, and they told me to pick-up their display shock (not charged with gas) tonight so that I would have something to keep the suspension from over-articulating and possibly losing the spring if it happens again. Really really really great customer service from these guys.