MenuMeters är kanske vad du söker?
Lägger alla eller valda funktioner av monitoring CPU, Disk, memory och Network i menyraden.
Från hemsidan:
The Net Meter can display network throughput as arrows, bytes per second, and/or as a graph. Both the arrows and the graph are scaled using a user-selected scaling factor and calculation. Scaling can be done on the basis of actual link speed reported by the network interface or peak traffic and can use one of several scaling calculations. The Net Meter menu shows current interfaces and their status. Interface information is gathered from the SystemConfiguraton framework and thus is MacOS X network location aware.
/Bosse