I've looked around the forum and I can't see that this has happened to anyone else, but my macbook pro (17" not core 2 duo) expanded by about 1.5 cm. I wouldn't be surprised if in the next couple of weeks we see a mass battery recall. As soon as its up, I'll post the link to the YouTube video of the battery itself. I have to say, I'm disturbed. If it had gotten much worse, I think it could have done some serious damage.