Detecting Anonymously Registered Domains
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.
There is already - you contact the email in the whois (if there isn't contact info on the site). In some cases it's unique email that goes directly to the site owner, sometimes you have to specify the domain in message and they send it to correct owner. In either case you will get the email delivered. If authorities need to contact the domain owner or know who it is, registrars will give them the info. Anonymous whois data doesn't mean you can break laws and do whatever, it just means that spammers/weirdos/random people on the internet won't get your name or home address. That's how it should be.