around 25°C at idle.
AMD Athlon 64 3500+ Venice, Golden Orb II cooling, case has one 120mm fan in the front, one 80mm one on the side draving in air directly to the CPU cooling, two 80mm fans at the back drawing air out, plus the fan from the PSU.
2 of the 3 80mm fans (the two that I added myself) are not running at full speed as the noise they make at full speed together is unbearable, and I even found that the temps are around 1°C lower than when they worked at full speed.