Spamresource.com has up a piece describing a new service that could be useful in evaluating the reputation of sites you deal with —
anonwhois.org returns information on domains registered anonymously. It provides a DNSBL-style service that "is not a blacklist and wasn't meant to be used for outright rejection of mail." Only 619,000 domains are listed so far, but more are added as they are queried, so the database will grow more complete.
Anonwhois.org seems to be a sister site to
Spam Eating Monkey.