The message on the page explains what's up. We're still recovering from some emergency maintenance, and it will be back ASAP.
Here's some more information about what happened, and what's being done about it:
Best Practical Solutions -- SECURITY ADVISORY.
At this point, we don't suspect that anything malicious was done to http://rt.cpan.org.
I'll try to post another reply when & if I have more information to offer, or if I get an ETA on its return.
We apologize for any inconvenience.
Linda (for Best Practical Solutions)