csshX is a tool to allow simultaneous control of multiple SSH sessions. csshX will attempt to create an SSH session to each remote host in separate Terminal.app windows. A master window will also be created. All keyboard input in the master will be sent to all the slave windows.
This has been tested to work on Intel/PPC OS-X 10.4, 10.5 and 10.6 (32 and 64 bit).
For full details, please see the manual page.