I'd say a combination of Facebook chat, Google voice, and the announcement of Apple's new exclusive free-texting club. http://www.apple.com/ios/ios5/features.ht

I'd say a combination of Facebook chat, Google voice, and the announcement of Apple's new exclusive free-texting club. http://www.apple.com/ios/ios5/features.html#imessage http://www.apple.com/ios/ios5/features.html#imessage