From Binarytoys Lab.:
Software for monitoring system activity like CPU load, network traffic, or RAM usage. Argus uses XP theme engine and always appears on the screen in correct colors and style. It occupies minimum space on the screen. Tuning of indication parameters very easy and intuitive with instant results. Different indicator types let you organize information in the personal style in a seconds. Argus works in the desktop toolbar, which placement could be easy changed, and supports multi-monitor systems.