r.joseph, while we are scratching around for an answer...
one more point that you do not make clear: How do you
know that "the cookie doesn't actually expire"?
Comment on Re: Loging a user out with CGI and Cookies?
Because I tested it locally with my cache folder open - the cookie didn't expire, and I will still able to access all the site's functions. However, many MANY good ideas have been brought up, and I thank everyone for your input. I think I will end up combining many facets of these suggestions to find a solution. Thanks a bunch!
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h "Violence is a last resort of the incompetent" - Salvor Hardin, Foundation by Issac Asimov