UPDATE: There seem to be some questions about the safety and reliability of this tool. When I have some free time I am going to conduct a behavioral analysis to vet the tool. Please refrain from using it until its been validated as safe.
I just discovered an interesting new site, reclaimprivacy.org, which according to the site admins is designed "to promote privacy awareness on Facebook and elsewhere."
The site works by "scanning your Facebook privacy settings" and warning you "about settings that might be unexpectedly public."
hat tip to Drew Conway (@drewconway)