Wired has a good piece on how the iPhone came to be which starts by telling us only months before it was announced, "it wasn't just buggy, it flat-out didn't work. The phone dropped calls constantly, the battery stopped charging before it was full, data and applications routinely became corrupted and unusable."

I love stories like this because what we see from Apple are almost always elegantly design and high quality, but behind the scenes it might have been a complete disaster getting there. Or another question I always wonder is what more was originally going to be included but had to be cut for one reason or another.