ClusterSSH for Emacs
ClusterSSH is about opening any number of xterm, ssh to a different remote
machine in each one of them, and providing user a unique input line to rule
them all.
ClusterSSH.el is about doing the same without quitting emacs, using term.el
as the terminal emulator and the ClusterSSH major mode for ruling them
all. It's available in ELPA and developed at the github cssh repository.
cssh.el going crazy
What happens when you try C-M-= . RET? cssh.el will
happily open all matching entries found in ~/.ssh/known_hosts, and that
could be a lot.

