An article in the latest Forbes alerted me to Flash cookies --ones that are stored in your computer using Adobe Flash and are NOT removed if you do the normal cookie removal process.

To learn more - and remove any Flash cookies from your computer - go here and then click on the link to Adobe. I found lots of cookies that I had no idea were in my computer --and deleted them via the Adobe site.

http://tips.webdesign10.com/flash-cookies-privacy