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
Network traffic rates
Tracked network connections
A static demo is available at http://www.carlos-rodrigues.com/projects/quicklook/demo/.