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This is interesting:

PUSSH is "Pythonic Ubiquitous SSH"

- a command line wrapper script for sending commands to multiple machines in parallel, i.e. in *real time*, with options for controlling the degree of parallelism, timeouts, and node selections.

PuSSH was designed for usage on networks / clusters / machine farms with lots, or multiple hosts (or indeed over the entire internet, for that matter), ideally wherein SSH is configured with Kerberos or RSA/DSA keys in such a way as to avoid any password authentication. Using PUSSH, you can send the same command via SSH to a range of machines of practically any size, and in parallel.