margu-NotebookInfo2 is a sidebar gadget, shows info about at least CPU, WiFi + Battery.

margu-NotebookInfo2 Features:
1. clock/alarm/calendar
2. uptime
3. cpu clock
4. cpu/ram usage
5. WiFi/network status
6. battery level/status
7. powerplans
8. multilang. support
9. MultiCore support
10. info panels can be switched on/off
11. theme

The license of this software is Freeware, you can free download and free use this diagnostic software.