Can anyone point me to a good thread or other source on the proper temps and humidity for eggs during incubation?

I'm still at least a couple months away from actual eggs, but I think I need to start planning now. I was originally thinking it might be neat to try maternal incubation... and I'd just set up an incubator as a back-up in case of roll-outs... but as I'm getting closer, I'm feeling less like leaving things to chance. I don't have perfect control of the temps in my breeding tubs, and I seem to have even less control over the humidity... and I know too much moisture is as deadly to eggs as too little.

So I'm wondering what the acceptable ranges are? And is there anybody out there with experience with maternal incubation?

I might just break down and slap them straight in the incubator after all!