UPDATE: Just posted by Robb on DataOutages mailing list:
Trouble Ticket Number: 7392092
Description of Issue: RIM is experiencing latency with PIN messages. This will affect PIN messages, Blackberry Messenger, Service Book delivery, and other Blackberry services.
Location of Issue: North America and surrounding areas
Start Time: Jul 23 2009 10:00 AM PDT
Symptoms you MAY experience: RIM Blackberry users may be unable to send/receive messages or may have difficulty connecting to the network.
Estimated time of repair: Unknown
I have been hearing sporadic reports from around the US and been sent a BBForums thread about BlackBerry Messenger and PIN’s getting delayed or not being sent at all. At first I thought it was just users of BBM 5.0 that leaked but it looks like it is also happening on older BBM versions.
Let us know if you are having any problems, where you are located, and if you are using the new BB messenger!
Thanks Matt for bringing this to our attention!