Quick Look is a package to collect system statistics and output pretty graphics and (X)HTML pages. It allows system administrators to have a quick look on the status of their systems, without going for a more advanced (and heavier) solution.

Quick Look currently shows…

CPU and memory usage

Load average and process spawning rates

I/O operations

Network traffic rates

Tracked network connections

A static demo is available at http://www.carlos-rodrigues.com/projects/quicklook/demo/.

via quicklook – Project Hosting on Google Code.

If you need to work on cluster, is nice to have syncronized terminals to send the same commands in parallel.

Is it also doungerous, so do some test before sending a bunch of vi commands!

On Unix, a cheap and fast solution is Kde “konsole” which has such option.

Look under “View/Send input to all Sessions” menu and try it out.  I was happpy with version 1.6.6 of konsole.
I am not a fan of “xterm variants”, but konsole looks great.