Speaking of informants or "rats" as they are known in the trade, there's a very cool looking new website, Who's A Rat?, dedicated to outing them and the cops they work for:

Who's A Rat is a database driven website designed to assist attorneys and criminal defendants with few resources. The purpose of this website is for individuals and attorneys to post and share all exclusive information related to local, state and federal informants...

Here's a press release-- on the site.

[It] is the first site to allow users around the country to post local, state and federal agents' and informants' names, pictures and related information

Not suprisingly, law enforcement is not amused. The site, by Sean Bucci, made its debut last week. It takes paypal donations. While there, check out the "rat of the week" feature.

Update: At least one federal court has ruled a defendant has a right to maintain a website seeking information on rats in his case.