Update 2004/11/08 (Obama Day): It's worse thane I thought. Not only are these features and controls hidden and almost impossible to find, but the controls don't actually work.

Flash Cookies: The Silent Privacy Killer disturbed me. Then I visited the Flash Player Manager page, saw all the sites that were tracking me via Flash cookies, and felt really freaked. I disabled Flash cookies, and encourage you to do so as well. I'm not yet sure how well it worked, as I just checked and saw an unwelcome Yahoo cookie, apparently added after I attempted to disable them.

While people are aware of HTTP cookies, I had never heard of Flash cookies before. HTTP cookies are legitimately required by various sites, but I don't believe Flash cookies serve any user purpose, and they don't seem to be required for any reason I care about, so I don't expect problems from clearing and disabling them.