Among the various iOS 5 features Apple chief Steve Jobs unveiled today at the company's Worldwide Developers Conference (WWDC 2011) was iMessage, a messaging option for iOS devices reminiscent of RIM's BlackBerry Messenger.
Apple said iMessage "brings the functionality of iPhone messaging to all of your iOS devices―iPhone, iPad and iPod touch." It is built into the Messages app, and allows users to send messages, photos, videos, or contact information to other iOS 5 users via Wi-Fi or 3G.
Like BBM, however, iMessage will include delivery and read receipts, and typing indication, so you know if the person has received your message and if they are typing back. Apple's iMessage will also have secure end-to-end encryption.