Existing users, 
Not useful if you want to drop a directory of files into it. For a command line alternative that will comb through a directory, see this:
http://blog.ambor.com/2009/01/recursively-md5-multiple-files-in-os-x.html
checkSum+
Handles and create sfv, md5 & csv checksum files.
Version: 1.5.3
