Update 2: RIM UK has also posted a statement:
BlackBerry subscribers in the Americas may be experiencing intermittent service delays this morning. We are working to resolve the situation as quickly as possible and we apologize to our customers for any inconvenience. We will provide a further update as soon as more information is available.
[Thanks to everyone who sent this in]
We know that many of you are still experiencing service problems. The resolution of this service issue is our Number One priority right now and we are working night and day to restore all BlackBerry services to normal levels.