Users of SSH::RPC
These are some of the implementations of SSH::RPC.
Plain Black's Automat
Plain Black (plainblack.com) has a hosting automation system called Automat that is designed to provision sites and services to servers in it's hosting network over SSH::RPC. This was the implementation that SSH::RPC was built for.
SysFink
The SysFink (http://code.google.com/p/sysfink/) monitoring extension system is built using SSH::RPC protocols.