David Hooton has made available to us MailSecurity's spamvertised site data for public use. I have turned that data into a SURBL list for testing:
ms.surbl.org
This is the same company that has provided the phishing data currently in multi.surbl.org.
Please do corpus checks, etc. but don't use it on high volume mail servers yet since it's only hosted on my mail server right now. Please let us know what spam detection rates you get and particularly about false positive rates.
At this point we don't know if the data will stay a separate list, be added to multi only, get folded into ws, etc.
The results you report will help us decide that.
Jeff C.