There is a few different species being referred to as a Pygmy chameleon.
If you are talking about Brookesia, I have a small group of B. thieli. I have them setup in an aquarium with 3 screened sides. I have an ultrasonic humidifier piped into it to keep humidity up. I mist them 3 times a day as well as having a dripper setup. I use a reptisun strip light and a 50w spot bulb at one end to create a thermal gradient, though they rarely bask under it. I use dead leaves as a substrate with low growing plants in pots. I have many, small, low branches that they can climb on as well. I keep the humidity between 80-100%. The temps between 70-78 degrees. I cup feed them small roaches, crickets, silkies, greenlacewings and anything else small I can find. I use Quantum Shade series vitamins as a supplement. I have had them for several months, and I havent had any problems with them. They are a wonderful species and I am left wanting to get more species of Brookesia.
Chameleon news posted a great article on Brookesia in Sept 2002. There is a link to a good key for figuring out what species of brookesia you have somewhere in the article. Great care and setup info.
Chameleon News E-zine
Here is a quick reference for their environmental needs and general info:
Chameleons Online
I hope this is of some help to you.
Or if this isnt the genus you were talking about, let me know the scientific name and I may be able to help you find some info.
Take care,