A new release, 0.9.2 of librsync/rdiff is now available for download http://rproxy.sourceforge.net/download.html This version does genuine and (hopefully) reliable delta-compression of files: a viable alternative to diff/patch and xdelta, and a way to do rsync over sneakernet or email. There are still some optimizations to be done, but I hope that at this stage both the programming and the command line interface are in their final form. I'd particularly welcome bug reports about portability, crashes/corruption, or documentation. -- Martin Pool