I just came across the fact that Rsync Version 3 is available for testing. I probably use rsync more than any other unix utility, and so I am very excited about some of the new features which include, to name a few:
I would also be curious to know the clever ways other people are using rsync. I have used it to do everything from synchronize directories to act as a software distribution system. It is also important to note that the license for Rsync is now GPLv3. The Samba team has made some very public statements about their support for GPLv3. This obviously limits the usage of rsync in proprietary software.