When I removed my MacBook from its Second Skin this evening at about 19:00, it was almost too hot to hold. I put it to sleep at work (by closing the lid) at about 17:35. It obviously didn’t sleep, or something woke it up. The fan was running at its fastest speed, but the machine was unresponsive - I couldn’t even get the screen backlight to come on. I forced it off by holding the power switch, and when it came on again it was fine - although the fan stayed running for another 5 minutes.
It’s the first time it’s happened and I’ve had it for over 2 months now. Odd.