The Flash Player Settings Manager hidden away in the depths of the Macromedia website, gives you the ability to manage your privacy settings and storage settings…
It lists, all of the domains which currently have been granted permission to store data on your local machine, it lists the maximum storage limit for each of those domain in kilobytes, how much data each of the domains is currently using in the form of SharedObjects on your local machine in kilobytes and then for each domain you have the option to change all of the settings. From this page you can also clear all permissions, clear individual permissions and set global permissions which all domains must obide by.
I am boggled as to why this resource is so hidden away, and not very well publicised anywhere on the Macromedia website. I think it should be a link displayed in the settings menu in the flash player.