Well, the battery on my MacBook did some weird stuff last weekend. As I was working on it, I noticed the aluminum sheet glued to the bottom started bubbling up on one side. I'm not exactly sure what caused this, but my cpu temps run up to 77 C at full load, though I doubt that the cpu caused it to do so. The battery recently started dying without warning 2/3 of the way through a full charge. I'm thinking something was just seriously wrong with the battery. It did fall into the first two week range that people are saying Apple is replacing, so I called Apple and they said they would replace it. But in in any case, it was rather disturbing to see my battery warping.