For those of you running highly-intensive game servers or even web servers, here’s a really interesting device that will let you monitor CPU, hard drive, memory, and network usage through an analog meter. Of course, I don’t think it would be too hard to add a digital LCD instead, probably even more accurate that way.
This is a fantastic project for anyone who wants to build one, there’s free C# code and schematics provided.
The USB Performance monitor is a PIC18F2550 based