Here are some links that I found useful as I began my search for the Old Santa Fe Colored Cemetery (located behind what was left of Mt. Zion Baptist Church); Monroe County, Missouri, USA -- I would insist on your trying to locate these types of sites for your own state or area of research! I've also attached links to a letter format I used to mail to all the funeral homes in the counties I was researching, to find out if there were burial records available for my ancestors, etc:
http://www.rootsweb.ancestry.com/~momonroe/negrocem.htm (a 'homemade' webpage listed on Rootsweb, giving a list of what could be deciphered from the ruins of tombstones and markers in the Old Santa Fe Cemetery. Edward Mitchell was murdered by my great uncle Ben Lue. He was the husband of one of Ben's sisters - he repeatedly beat his wife, my great aunt. In retaliation, Ben found him one evening, and stabbed him to death. From what I understand, my great uncle Ben was put to death also after the trial - judged by Judge W.D. Summers, the Judge who brought Jesse Loo, my great-great grandfather, to Missouri as a slave - and eventually freed him! These homemade pages can be your best friend, as they are a word of mouth means coming from older folk who actually know or knew the locations!)
http://cemeteries.missouri.org/Main.html (the people that run this website are VERY knowledgeable about state cemetery law, how to retrieve and list correctly latitude and longitude for GPS search - they gave me the coordinates that led me to my family's plot!)
www.findagrave.com: What I love about this website is that you can request someone find a grave for you, and they do just that! I've had successful grave searches done for family members around the states through generous volunteer efforts on this website - and I do the same for others as well!