ClusterSSH is a graphical cluster administration tool that runs from your Linux graphical desktop. Once you install the RPMs, share your pulic SSH keys, and define a cluster in "/etc/clusters", you can enter a command in the central console and it will be run siumultaneously on all the clients.
The software is a little quirky at present because you see all the terminals open on the desktop and the results appear on each screen as it is executed, however later versions may improve on this.
For more details and installation instructions see: http://www.unixmen.com/clusterssh-manage-multiple-ssh-sessions-on-linux/
This utility could help act as an AIX to Linux migration aid?