Darrell (support@invariantsystems.com) quoted:
An example of some that we've found in SURBL for example are declude.com, usinternet.com, and w3.org
Murphy can strike everywhere, but those three aren't on SURBL from my POV. Besides w3.org is the second example on the page http://www.surbl.org/faq.html#local-whitelist
I've no idea how to check SURBL's WL: That might be a case of security by obscurity, but AFAIK w3.org is "whitelisted" by SC, so even if SURBL screws up w3.org shouldn't reach sc.surbl.org
Bye, Frank