All those "hot or not" websites wasted domain names, but this I see as a potentially valuable (free!) service. :)
Data is submitted by pretty much anyone, by the look of it, but it's for famous and obscure alike, for example:
http://www.findagrave.com/cgi-bin/fg.cgi?page=gsr&GSfn=George&GSmn=&GSln=Burns&GSbyrel=all&GSby=1896&GSdyrel=all&GSdy=1996&GSst=0&GSob=n
Now, if it used GoogleEarth I'd be impressed...