I just saw this video about IOS 5:
Look at the 39th second of the video. It is a message to Steve Jobs saying: "Great idea! I think it could work".
What a bad joke! Steve Jobs is just using the same idea that Android does and that nokia used years ago with Maemo and N900.
For me there is no "good idea" or "it could work". If apple insists to be a bit more late to have this concept for the devices they will break one more time.