Blacklists known targeted advertiser domains from setting cookies. Supposedly tol be regularly updated.
https://chrome.google.com/webstore/detail/hhnjdplhmcnkiecampfdgfjilccfpfoe#
Also buried in this thread:
http://th3core.com/talk/web-development/ie9-comes-with-preinstalled-'do-not-track'/msg6428/#msg6428
I tried this one out and it requires you to accept 3rd party cookies, and it gets trashed by other add-ons like Ghostery. Nice idea though.