I recently purchased the Artic Cooling 64 Professional for AMD 3700, it has had a profound effect on my temperatures, its really easy to install, took me 5 minutes. It is relatively cheap and lowered my temps by approx 10 centrigrade.
AMD Athlon 64, 2200 (11x200) 3700+,ASRock 939S56-M, SiS 756 AMD Hammer,NVIDIA GeForce 6600LE, 2048(DDR SDRAM), Maxtor 5A300J0 300GB 5400RPM, Ultra ATA/133)
Time tells all, but if the moment in time passes and you miss it, then you will remember it for ever!!