Joe,
Raymond and Jeff recently invited me to provide my data feed for SURBL. I agreed because anything that helps people block more spam is worth supporting. There was just one catch: more than a year ago I had started the list by seeding it with other people's lists, which in hindsight was not a good idea, as I couldn't vouch for all entries and occasionally had to drop entries. Recent entries (from early December 2003 onward) use a quite rigorous protocol that has served me well. I have had but a single complaint about more than 6000 domains from that data set.
Welcome aboard, we are very happy that you want to share the dataset. Its been very usefull the last few days allready.
If people want to try check the projects Joe is working on, check:
http://www.joewein.de/sw/index.htm
Especialy his SpamSpy would be very helpfull for endusers.
Bye, Raymond.