Not sure why, but today I tried to iMessage a couple of people on WiFi with my iPod Touch and on both I got a 'Message Failure' with a red exclamation next to the message. I thought it might have been a wifi issue so I went on my iPad on 3G only and tried sending the messages. Same thing happened... On both devices I turned iMessage off and turned it back on, verifying my email/password and restarted the devices. Tried again... nothing. Any help? Anyone else having these problems?