Earlier today Apple began notifying some international iPad customer who had placed pre-orders that, due to flight delays their iPads may not be delivered on May 28 but instead on May 29. Following up with FedEx, TiPb was first told that a hold on delivery placed by Apple had caused the delay, and then that due to Apple's desire to have iPads show up on May 28 and no earlier (except in Europe, right?), FedEx lacked the capacity to deliver them all on the 28th. Apparently FedEx had an agreement in place with Apple to continue to deliver to residential addresses until 10 or 11pm tonight, and through the day tomorrow. Customers with business addresses not open late or on the weekend may not be so lucky, having to way until Monday to take delivery, or heading over to the FedEx facility to pick it up themselves.
Again, we don't know the service level agreements in play here, but definitely not a situation Apple or FedEx wants to be in.
If you're still waiting on your international iPad delivery, or if you've gotten any further info from FedEx, let us know in the comments!