François Beaufort has posted that the latest build of Chromium seems to have a fully functional DNT feature.

It is disabled by default though Google developers have made it a very prominent option in the settings.

Here is what the feature does:

Enabling ‘Do Not Track’ means that a request will be included with your browsing traffic. Any effect depends on whether a website responds to the request, and how the request is interpreted. For example, some websites may respond to this request by showing you ads that aren’t based on other websites you’ve visited. Many websites will still collect and use your browsing data - for example to improve security, to provide content, services, ads and recommendations on their websites, and to generate reporting statistics.