Hexagora
Performance Monitor is a small system monitor that can
be placed on the desktop and/or in the system tray. It
displays the current CPU, Memory, Disk and Network
utilization with the help of animated graphs. The
program is very customizable and lets you choose which
panels to display, what colors to use, and which
statistics to show on the desktop or in the tray (or
both). The statistics panels come in two sizes and can
be placed anywhere on the desktop.