Ron Darrah points out that the Indiana Department of Natural Resources' Division of Historic Preservation and Archaeology has a great Indiana cemeteries registry online. The cemeteries registry is part of the State Historic Architectural and Archaeological Research Database (known as SHAARD).
From the SHAARD page, you must click on "SHAARD Access," then look for the link on the right side of the page to "Enter SHAARD as a Guest." Once you've read through and accepted the Terms & Conditions, you're taken to the screen for Structural Surveys. You'll want to select "Cemetery Registry" from the Survey Type, then you'll have the option of searching by either county, historic name or even the city. Clicking on the "Search" button then displays a list of results. Many of the listings include photos of the site, and some even have burial readings included with them. There are also maps (which you may need to rotate).
DNR staffer Jeannie Regan-Dinius has done a great job accumulating a massive amount of data. It's always a work in progress, so please donate additional information if you have it!