Link: http://code.google.com/p/csshx/

I wish I would've put forth a little more effort toying with cluster ssh'ing when I was at my former place of employment, but I was happy enough with for-loops and ssh keys. On my new job, there are far too many hosts to go through doing that. So cluster ssh'ing appears to be an invaluable tool for my day-to-day activities. There's a recent project that caught my eye. It's essentially an OS X port of cssh to use Terminal.app rather than X11 xterms.

Installation is a snap. Just untar. Name your clusters in /etc/clusters and run csshX cluster. It'll spawn however many ssh sessions in separate windows and then tiles. Input in the master window goes to all the child windows.

Use with care of course.

UPDATE: For Snow Leopard users, you need to change the path to perl at the top of the script to '/usr/bin/perl5.8.9'. The version that Snow Leopard uses by default (5.10.0) is compiled 64-bit which for whatever reason does not work with the csshX script.