Yeh Cochamo is awesome. I spent 3 weeks there in Feb 08.
Apart from the rain and rounded cracks we had an amazing time.
This is a good website. Daniel and Silvina own a hostel/refugio in the valley close to all the climbing and they are climbers and know the area very well. http://www.cochamo.com/cochamo/
There is a bit of info on routes throughout the web, Daniel was planning on a guidebook. He has a big new route register in the hut.
The potential for new routes in incredible though a major effort due to rain and generally vegetated cracks.
We got scared of a few big routes due to weather but there is a bit of cragging and some shorter routes 300m.
Be prepared for painful walks in to some of the areas.