Overclock-UK has a neat SunBeamTech Overclocker Cooler Kit. Pretty neat if
you're still on air cooling you might want to look
The basic idea is to take cool air in the front and blow it onto your CPU
(You probably already know this but I'll repeat it for the new kids) and then
for your PSU or case fan to suck the warm air out. This would work better with
a dual-fan PSU as the PSU scoop is designed to help with the hot air removal
but I think my back case fan did good enough.