Ebay doesn't do this yet but other sites do
See
http://en.wikipedia.org/wiki/Local_Shared_Object
Already a website Habbo Hotel uses Shockwave and when it bans you it puts a local shared object to track you as a hidden cookie, too.
Also see
http://en.wikipedia.org/wiki/Adobe_Flash_Player#Internet_Privacy.2FPersistent_I dentification_Elements
Browser K-Meleon has a built-in Flashblock feature that works if Javascript is on.
So if you ever see ebay starting to put Flash on its site, watch out!
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