Have you been affected by today's iMessage outage?
According to http://apple.com/support/icloud/systemstatus/ "Some users are unable to use iMessage" and Apple is working to resolve it "ASAP".
I noticed earlier today my iMessages weren't getting through, but now they seem to be fine.
Apparently the outage affected "Some" FaceTime users as well.
Were/are any of you iOS or Mountain Lion users affected?