A new-to-me anonymizing referrer appeared in the referrer logs today, AnonymZ.Com.
From the Web site:
To make a long story short: anonymz.com is a free and easy way to block the referrer when a visitor clicks a link on your homepage. It works with every browser as you do only have to add a http://anonymz.com/? in front of every outgoing http:// link. Use it as you want.
A note, this service does *not* block your IP Address, cookies or other information that may be logged when you visit a Web site, it only blocks the referrer of the site you may have clicked a link.