Don - that's a great idea! I was thining about it and on this particular site i don't mind if all required fields are flagged, but it would be good to differentiate on most public sites.
Joel - I agree that "in general" most things shouldn't be required for public sites using public services. My setup is for a private site for minors where we both have a pretty captive audience that wants to please us and need certain types of information in order to send out parental consent forms for participation in our "real world" program.