If you have African-American ancestors in your family tree, you might want to browse through the African American Cemeteries Online website. The site is organized by state, county and then cemetery. There is a section for cemeteries outside of the United States in Canada and Barbados as well. When available, each cemetery page will list known burials and the dates for each individual.
If you're unsure of the exact burial location, you can also search the full website from the homepage. Just make sure to mark the radio button to search cemeteries, rather than the web.
This free genealogy resource has more to offer than only cemetery transcriptions. From the left sidebar, you can access pages for black churches, black funeral homes and death notices. A little further down on the same sidebar, you can click to pages on cemetery preservation, including the names of endangered cemeteries and state preservation agencies.
If you're done exploring the parts I've covered, don't rush off. On the menu bar beneath the header, you can find even more resources for your genealogy research. The forum is for cemetery queries and discussion of issues related to African-American cemeteries.
If you don't find the information you are seeking there, click on the Queries link in the same menu bar to go to the queries submitted to the site prior to the addition of the forum. You may find someone seeking information on the family you are researching. Email addresses are included with the queries so you can contact them. Keep in mind that the query page appears to date from 1999 and 2000 so it's possible that the email address may be out of date.
Last but not least, check out the links page from the menu bar for more free genealogy resources. This page includes links to sites for cemetery databases or photos, historical or cultural information, state preservation societies and more.