Symptom Checker at About.com (Online Dx Tool)
Just stumbled across another Online Dx Tool, the About.com Symptom Checker, which seems to have been created by Harvard Medical School.
Like a couple of others, this tool can be be navigated by clicking on a map of the human body:

My playing around with it resulted in a message that was funny to someone as easily amused as I am:

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June 28th, 2007 at 8:51 am
It least it didn’t say “We’re sorry you are a pain in the neck.”
June 28th, 2007 at 9:02 am
Good point, Jane.