Heh, my dad just called me to tell me that the HDMI on his Explorer HD 8300 is no longer working. It would have weird stuff on screen when going between SD/HD channels and then it started just having black screens. He would have to go to another channel and come back and even that wouldn't always get it to load.
He hooked up components and now it's working fine and he can't see a difference so he doesn't much care.
Crazy how it happened shortly after reading this thread.