Yesterday morning there was a nationwide, 4 hour, BlackBerry outage that affected yours truly. It seems to have been a major problem for Cingular and T-Mobile as they both confirmed a full fledge disruption in service. Nextel said that some customers reported a delay in email and Verizon and Sprint said they had no complaints.
The error was at RIM yesterday I believe, my inside guy I talked to said something about the SRP having problems.