On Friday, I heard about the Unsubscribe.com service. This service is supposed to make it easy to unsubscribe from mailing lists. I beloved that their service knows about the various mailing lost software commonly used, and knows what actions are required to unsubscribe from a list managed by each.
Since the charge for the premium level of their service, I hope that they also will help unsubscribe from lists where manual steps are required.
I signed up for an account, and then when I got to the step where I needed to install the browser plugin, I stopped. The Chrome browser plugin requested permission to my data from mail.google.com. I didn't see a way to restrict the access to one account. Since I can't verify what information it accesses, and there are certain accounts on which I want to make sure that no unauthorized access happen, I will not install the plugin.
What Unsubscribe.com should do is create a Google Apps Marketplace application. Then I could install it on the account that I am interested in trying out the service, and none of the other accounts could be compromised.