systemBlox is a free Yahoo! widget that will let you monitor nearly everything about your computer. Displays the percentages to you in neatly stackable blox. Each block has its own window. Each window is fully controllable. Allows individual sizes, window levels, and opacities, and refresh rates.systemBlox monitors the following: Total, System, and User CPU load, virtual and physical memory usage, wireless signal, battery, used or free drive space.Requirements: