[MobWalk]

I'd suggest downloading smcFanControl. That's what I use on my MB Pro, and it works well. You can set different modes that will keep the fan at or below a certain RPM. If I'm gaming, I let it go up to 6200 rpm. If I'm not doing much (like now, just browsing on the internet and maybe running a couple other programs) I drop it to 3000rpm. That usually puts me around 45* C and keeps it nice and quiet. Then I've got a middle setting at about 4200rpm that makes some noise, but isn't quite as obnoxious as full throttle.

[shearn89]

+1 from me: smcFanControl is seriously handy if you do any sort of coding on a macbook. Was recently running a genetic algorithm on it and the app allowed me to bump the fan speed up to something ridiculous in order to keep the cpu at a comfortable temperature. I also tend to raise the speed if I'm watching flash video, since that's still ridiculously cpu intensive on a mac...