Finalmente, o Feedburner começou a enviar o status code 301 (redirecionamento permanente) nos links dos feeds para quem usa os serviços de estatística dele. Agora virou algo que vale a pena pensar em usar.
As of today we are changing this to be a “301 Permanent Redirect” because we’ve looked at the traffic enough to tell that there some benefit to changing this to a “301 Permanent Redirect” – in that some search engines that index the feeds themselves will consider these to be additional links that should be used in determining the popularity of your site.
Link: AdSense for Feeds: A small yet noteworthy change to our item stats link serving