You might be interested in the service started by, Stuart Sandler called TypeSnitch. The name is horrible but to the point and more information can be found in this thread...
I'm regularly stumbling upon websties which are using webfonts from which I certainly know that they are not available for web-licensing yet. Or in other cases I see poorly rendered versions of iconic typefaces and the CSS tells me that this must be FontSquirrel outputs.
How should I address this problem? Playing police and reporting this to my type-design colleges?
(I might do that, if they are my direct friends or employers, but for the rest I don't like to be this guy.)
Shouldn't there be a kind of blacklist where such websites can be submitted?
If interested in hunting violation, foundries could browse through it themselves.
This might also create some awareness under web-developers who mostly are not interested in such "boring" details but rather discuss workarounds:
http://stackoverflow.com/questions/4905932/font-face-blacklisted-font