SpamCop's Spamvertised sites page is up but not currently serving data. I've take this opportunity to make sure that the SURBL engine does the right thing when there's no new data coming in. When that happens the sc.surbl.org list stays unchanged except for domains that may come off the list due to expiration of old reports.
Once the data feed is up again, sc.surbl.org should pick up where it left off and things should continue to operate normally.
As an aside, the next version of the data engine will have a much longer memory, especially of spam domains and IP addresses so there won't be nearly as much churn in the domains. There will also be more domains on the list.
Cheers,
Jeff C.