From the website:
Creating an index to the Supreme Court case files is a huge task, involving many members of the TSLA staff. Supplemented in the early stages by grants from the Supreme Court Historical Society and the Administrative Office of the Courts, the project continues with funding from the TSLAFriends and Ancestry.com. With more than 35,000 cases entered so far, we estimate the project is about 25% complete. Updates are being added to the website as the work progresses.