That's what BlackBerry users across many carriers are reporting this morning... BES users seem to be ok, and not everyone seems to be affected, but the word so far is that there are BIS difficulties today. Are you getting your emails? Let us know in the comments to this post or keep up to date in the forums...
Update: DataOutages.com is now reporting that AT&T 's issue has been resolved. Looking at comments/posts it seems most people who experienced problems are starting to get emails again, so I'll drop the ALERT off the subject title in hope that the sailing will be smooth from here out. Strange that users across carriers were effected though...I wonder if we'll hear what caused the hiccups.
