I'm trying to identify this short story:
Humanity has made a transition from being corporeal beings to digital ones, their consciousnesses being run as a computer program. One day there's a power failure, and some of the consciousnesses get shut down (they "die"). They wake up in the afterlife to find themselves in a dark place with a single person. He had been left there to guide the dead to heaven/whatever, but it had been so long since he'd seen anyone that he no longer knew the way. Soon the power came back, and the people were removed from the land of the dead, and this guide was left alone again.