The new Notification center in iOS5 is highly inspired by the Android notification system, except that it looks much better and functional. Other than this, iOS5 also has a new messaging system for iOS users, iMessage. This new service will allow iOS device users to interact with each other for free. iMessage has the potential to be a true BBM killer.
Despite of it, iOS 5 brings over 200 new features and interfaces in the iPhone, iPod Touch and the iPad.