If you go to their last blog post:
http://blog.iphone-dev.org/post/1086032828/its-a-trap you can bypass the error screen. If you go to:
http://blog.iphone-dev.org/ then you will get greeted with the message:
Sorry! An error has occurred.
This incident has been reported, and we will work quickly to correct any issues.
We're very sorry for the inconvenience.
Please feel free to contact support if the problem persists.
That's what I'm encountering at the moment... but it may come back up.
*Edited: It seems to be back up... for now.