I've had some good success using the method of incubation described in the below article. I have 4 Carpet clutches in incubation right now.
Give this article a read from Kevin Stanford on Chameleons E-zine.
http://www.chameleonnews.com/?page=article&id=47
This has some great information about Carpet incubation as well as a wealth of other things.
For the clutches I have in incubation now, we are keeping them a hair above room temp, 73 degrees. Thats for about 35-40 days. Then we drop the temp to 55 degrees for about 40 days (referred to as Diapause).
After that, we put them back at the room temp for the rest of the time until they hatch. We've had great hatch rates using this method. Of course, we are watching the moisture in the incubation bedding as well as monitoring humidity.
Hope this helps.
Sage