My main system has 11 fans:
4*80mm Dynaeon case fans, 2 in & 2 out. (2 are blowholes)
1*80mm power supply fan
1*60mm heatsink fan (CPU)
3*40mm hard drive cooler fans
1*20mm Northbridge fan
1*486 heatsink fan (GeF2-MX vid card)
The Duron 700 CPU runs stable at 1083MHz. Average temps:
CPU: 39 Celcius
Case: 24 Celcius
This system really isn't that loud but it does appear to hover about 1/4" above the desk when it's running.