Before there was FindaGrave.com, Atlanta had Franklin Garrett. In the early 1930s, Garrett traveled throughout Atlanta and recorded the headstones, mainly of white males, in over 750 cemeteries. In the 80 years since his survey, many of these graves have weathered away, been overgrown, or destroyed, making his work a priceless piece of Atlanta's History.
Today, his database is referred to as Garrett's Necrology. It can be viewed on microfilm or searched online, both at the Atlanta History Center. Although I haven't found family in this database yet, I have used it to find grave that are not my ancestors. For anyone researching ancestors in Atlanta, this database is a must.
And of course, Garrett's burial listing can be found online at FindAGrave.com.