My CF card heated up enough that it felt somewhat hot (not warm) to the touch after viewing images on the LCD of my D1x for a few minutes (upon removing the card). The area near the grip on the front also heated up a bit.
Hah, that's funny. As long as my camera or card don't have extra resistance beyond the normal, I'm happy to call it a day and split the difference.
I guess they do get pretty hot, but that was just the monitor, not even the image sensor (since I wasn't shooting when it occurred). Just wasn't sure if this was typical or not after only a few minutes of continuous LCD use.
Maybe it has happened and I just never ejected the card that soon after use.