I'd be happy to share what I know. Skinned meshes like bows and armour are, for the moment, restricted in their usability unless you have max. Static meshes like swords however, appear to be easy. Collision meshes are still a little sketchy, but I'm going to be experimenting with them later on today, I'm trying to build (and write a tutorial for) custom bows. So far, the best combination of tools seems to be 3DS Max+niftools plugin, Photoshop or Gimp+Nvidia DDS tools for texturing, and finally nifskope for object management. So specifically which bits would you like to know about? Are you using Maya? Do you know of workflows for copying Maya data to Max (including Verts/ Vert Weights/Bones, etc)? I have never tried to move that sort of information between Maya and Max but I think to export as an FBX file would be your best bet.