WaterMark is a simple screenlet which can display several information in a light way, like:
- CPU load - multi CPU/core load (up to 16 core) - list of more CPU consuming processes - memory and swap load - network usage (no configuration required) - Wifi ESSID and signal quality (no configuration required) - all temperature, fan and electric sensors (support lm_sensors, temperature from ACPI sensors, temperature from nvidia video cards, temperature and fan from ibm acpi, and hard drive temperature from hddtemp) - hard disk usage - Analog and digital clock - Battery state and global capacity
The licence is GPL.
You can find more information about it here: http://gnome-look.org/content/show.php/WaterMark+system+information ?content=71960