Flash-Cookies
Security Brief 
IT Pros and most savvy users know all about the role of Web site cookies that are placed on your PC and how to delete them. However, Flash (cookies) are different and their role is probably much less understood, even by the pros.
These cookies work similar to regular http cookies, but they are larger and more powerful! More important, they are harder to find, and you do not have the normal capability to remove and/or control them!
To manager the Flash player settings on your machine, visit the Adobe Flash Player Help - Settings Manager Web page. Click on the links under Settings Manager in the left navigation bar to access each section of the Flash Player Settings Manager.
If you want to go one step further, check out the BetterPrivacy Firefox add-on, which promises to remove these cookies each time you close the browser.
For more info from Wikipedia, click Flash Cookies
I chose to download the Firefox add-on. This gives me control, and I set it to automatic removal.
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