Yup, same thing here. It was up a few hours ago. It went down again. Not sure what is going on. When RPC1.org went down twice late last year, it was due to the boot loader on their server (LILO I think) corrupting the boot record, leaving the machine unable to start up. They apparently switched boot loaders since then. Not sure what caused the problems yesterday.
Currently, it looks like a database problem.
It's useless detail, but I thought it might be more useful than a blank page with an error message.