Yep, here is a list of proggies.
HW Monitor (my fav)
RealTemp (next fav)
Mobo temp monitoring software and the sensors they use are pretty inaccurate.
Benching software and such is very varied. I use these for each purpose:
These are pretty standard and used by many.
Monitoring the PC temps overall: HW monitor aka hardware monitor
CPUZ for CPU info
GPUZ for GPU info
CPU only: Real Temp
GPU only: ATI Tool, I have a Nivida GTX280, so it works on Nvidia
CPU loaders: Prime95 and OCCT
GPU Loaders: ATI Tool and the best one is Furmark, nothing pushes the GPU harder right now.
Benching for overall graphics/gaming performance is 3DMark06