it was mentioned by Adam Christianson either on the MacCast. That was actually what made me pay attention to it, and made me realize the tiny crack mine came with (at the headphone jack) was more than just a fluke flaw.I'm also amazed that the cracking issue isn't mentioned on any of the Apple podcasts that I listen to. I keep waiting for one of the hosts to mention it, but they haven't so far.
I think this was the episode I was thinking of.