At last night's meeting, during the round-table discussion, someone asked about setting up simultaneous SSH connections to multiple host sytsems.
Here's the program I was thinking of...
ClusterSSH: http://sourceforge.net/projects/clusterssh/
For MacOS X, there's also csshX that interfaces to the Terminal.app...
csshX: http://code.google.com/p/csshx/
Adam also mentioned PSSH...
http://www.theether.org/pssh/docs/0.2.3/pssh-HOWTO.html http://www.theether.org/pssh/
Both PSSH and Cluster SSH are described in the following article, along with yet another option called Multixterm...
http://www.ubuntugeek.com/execute-commands-simultaneously-on-multiple-server...
Hope that helps!