I am trying to test run my .obj loader and can't find much of anything at all on the net for .obj models with .mtl files that are free? Anyone know of a site I could download some simple models for free. Thanks

If you have something to convert them try:
3d cafe (free aircraft section)

Gizz

turbosquid has a few, but also a lot of .3ds models for free if you want to use another tool to convert them into .obj, and then test them out.