*UPDATE* - This issue is now marked as resoved, if you had problems it is just a matter of getting the backlog of messages delivered right nowbut otherwise, service have returned to normal.
Looks as though some North American and LATAM BlackBerry users are experiencing an outage. It's not affecting all carriers but folks may experience delays in sending or receiving messages or in using services such as BlackBerry Messenger:
BlackBerry Services (Roaming Relay)
Unable to update BBM Avatars
As of right now, RIM is aware of the issue and is working to resolve the situation as soon as possible. We'll update everyone when we hear it has been resolved. The estimated amount of people affected is relatively small, sitting at only 6.25% of users.