PhishTank is a new service by the OpenDNS guys. It’s a public clearinghouse of phishing data. Users submit phishing sites/emails, and other users verify whether or not it’s actually a phish. The data is all available via API, which means people can make cool apps that access this growing wealth of data. A web browser could check URLs you visit, or Spamassassin or your mail client could check emails for phishing links. The FAQ has more info, but this looks to be a very good idea. PhishTank is also tied into the OpenDNS free DNS service, so it will help block phishing sites before OpenDNS users even see them, and in the future OpenDNS’ other sources of phishing data will feed into PhishTank as well.