Looking at some of the images, there seems to be a single light and heavy ambient occlusion(lot's of tuts around on that). Whether he color corrected the image or used colored ambient occlusion right in the 3D package I don't know. And you can get an isometric camera simply by having a persp camera and checking on "Orthographic" in the shape tab.

Another poster had a similar question about the low poly look and posted how they went about it in Maya.