I've got my Q6600 G0 Stepping up to 3.3 Ghz, stable. I use a Thermaltake Blue Orb 2, and temps were around 30idle 40load, give or take a few degrees. (Celcius). I have since down clocked to 3.0 as it provides sufficient power and I like my temps in the 20*'s. I have heard of people going up to 3.6 stable on air.
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Q6600 overclocked @ 3.0 Ghz | 1.35v
Thermaltake Blue Orb II Heatsink 120mm fan | Idle 18*c / Load 30*c
Asus P5K | LGA 775
G-Skill 2 x 2gb DDR2 1000 Mhz
Ati Radeon HD2600 Pro 512mb Coming Soon, Geforce 9600 GT KO GDDR3 1.9 Ghz
Antec 900 | 1 x 200mm + 4 x 120mm fans
Gusty Ubuntu 7.1 + Vista x86 Ultimate + Fedora 8
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