I have a Athlon XP 1900 and the cpu temp usually stays between 50 & 55. I found out about a cool little program that cools your CPU down a ton, at least it did for me. Here it is..
http://www.cpuidle.de/
Under normal load my CPU temp has dropped all the way down to 38 using this program. It is shareware however, but if I don't have any problems the first 30 days I will consider buying it.