Because of this article I installed the BetterPrivacy Firefox extension. Looks like a good no effort solution; I have it set to silently clear Flash cookies and super cookies when the browser closes.
BetterPrivacy is good; it blocks Flash cookies, but I don't think it does anything against browser fingerprinting, which is also a type of supercookie (at least the way I use the term in the article.)
http://www.boingboing.net/2010/01/27/panopticlick-effs-to.ht...
Ever since I replaced the Macromedia folder with a file called Macromedia, BetterPrivacy hasn't erased a single LSO. Everything works.