Hey guys,
If anyone here is doing 3d stuff with Gambit, you might find my OBJ model loader useful. It'll load vertices, normals, and indices for models from the Wavefront .OBJ format. I'll implement UV coordinates soon. I wrote a blog post about using it and posted the code (it's also in the gambit iphone github project and I'll be improving it there):
http://jlongster.com/blog/2009/08/3/iphone-physics-and-models/
I also studied Gambit's serialization mechanisms using object->u8vector for compressing models and speeding up loading times. It turned out great! You can find examples in my post.
Hope someone finds it useful. Thanks - James