Mac OS Utilities
MiniUsage displays various data like CPU usage, amount of network flow, battery status and process names which uses much CPU time in a menubar. It takes little space and can display various data, so it's suitable for notebook.
While the application is running, this information can be referred via AppleScript.
If you like this software, I'd like to ask to make small donation to help effort for the Japan earthquake and tsunami disaster.
Added function to display multiple data on menubar.