For instance, Blogger.com allows you to directly link the Adsense account with your Blog - you can disable this here. Here's an explaination on the site:
If you use a third party service (such as Blogger) to manage your AdSense account, that service will be listed below as a host. Hosts are sites or services that require access to your AdSense ad code and reports in order to provide you with AdSense account management through their site.
Hosts do not have access to your address or payment information and you can disable their access to your AdSense account at any time.
This setting will not effect Adsense publishers who have manually inserted the Adsense code in their Blogger templates.
