How do you cool down your system?

my whole PC crashed several times yesterday because of overheating.

System Config:
Q6600
8 GB RAM
8800 GTX XXX
Several Harddisks
etc etc..

Bought myself a slot-fan to cool down the gfx-card but doesn't help that much.


CPU starts with 36 C (96F) and reaches over 60 C (140F) during gamplay.
GFX card starts with 60 C (140F) and reaches over 80 C (176F) during gameplay until the PC crashes.

I'm gonna buy myself a bigger PC case with more case-fans.

any ideas which would help me getting the hardware cool?