I would say step one would be to invest in a good aftermarket cooler. Like a zalman 9500, or thermaltake big typhoon. My zalman made a big difference one I got it installed. Just make sure to apply some arctic silver 5 thermal paste in a THIN even layer. Or you could make the jump to watercooling, but that is a pretty big leap. I know people, including myself, are getting great overclocks using good air cooling with the C2D.
C2 Q6600 @3.6
2- 1GB Crucial Ballistix DDR2 1000(1100 @5-5-5-12 2.2v)
2 EVGA 280GTX in sli
2 WD Raptor 74GB(RAID0)
1 WD Raptor 150GB
X-FI Fatal1ty Edition (Beyerdynamic DT770/80 with PA2v2 amp)
PC P&C 1 Kilowatt PSU
Dell 3007 WFP 30" LCD
LG 18x DVD/CD RW
Silverstone TJ09 (5-120mm Sythe S-Flex fans)-Best case on the planet...
Watercooled. Iwaki MD20RLT>PA120.3(6 fan push/pull)>Apogee GT>2 MCW60's>T-line