SpeedFan - Hardware monitor for Windows that can access digital temperature sensors located on several 2-wire SMBus Serial Bus. Can access voltages and fan speeds and control fan speeds. Includes technical articles and docs.
Process Tamer - Freeware Microsoft Windows utility that monitors the CPU use of applications, alerts when they use too much, and reduces their priority to keep your PC fast.
Open Hardware Monitor - Monitors temperature sensors, fan speeds, voltages, load and clock speeds, with optional graph.
Big Meter Pro - Big Meter Pro is a utility that monitors the disk and memory of your CPU.
smcFanControl - [Download] smcFanControl 2.
AMD64 CPU Assistant - AMD64 CPU Assistant