PhishTank, from the people behind OpenDNS, aims to catalog phishing sites. ⇒
3 October 2006, early evening
You can submit scam sites to them, which can then be verified by other uses. There is an API for doing this all programmatically. I can see FireFox and other browsers making this labeling and verification work simple/automatic.
This is a post from my link log: If you click the title of this post you will be taken the web page I am discussing.