Core Temp is a compact, no fuss, and small footprint program to monitor CPU temperature. The uniqueness of it is that it shows the temperature of each individual core in each processor in your system! You can see in real time how the CPU temperature varies when you load your CPU. It's also completely motherboard independent.Core Temp (V 0.99) supported on all Intel Core and Core 2 based processors as well as the whole AMD's Athlon64 line of CPUs. For full list of supported CPUs, click here.
Its logging feature, allows a user to easily record the temperature of his processor(s) over any period of time, then the data can be easily transferred into an excel datasheet for easy graphing.
Core Temp works on Windows 2000, XP, 2003 and Vista (32bit and 64bit). (Source)
License: Free / File size: 100Kb