Multixterm creates multiple xterms that can be driven together. At our site, we use it to ssh to all the hosts in a cluster and do maintenance on all the hosts simultaneously. Particularly useful with ad hoc or one-of-a-kind maintenance. Also very cool for debugging host differences. I would've paid for a program like this but here it is for free!
http://expect.sourceforge.net/example/multixterm.man.html