I run a Cel333 and I have a nice big fan and I run RAIN to keep my CPU cool.
Temp Stats:
Rain Off, Fan Off, RC5 Off: 38 C
Rain Off, Fan On, RC5 Off: 35 C
Rain On, Fan On, RC5 Off: 27 C
Rain Off, Fan Off, RC5 On: 43 C
Rain Off, Fan On, RC5 On: 39 C
Rain On, Fan On, RC5 On: 35 C