I have just been listening to that modcast too and while it generally sounds nice to be able to read *.3dm files directly into modo, I still think I wouldn't really want to go that way for reading rhino files -- just because tesselated rhino-data is pretty much exactly what you would not want to have to deal with in modo (complete triangle-mess in my experience).
I think I would still stick with using moI as a translator (via *.lwo, which is working absolutely great since the latest beta, even with the current modo203), simply because the meshes it generates when exporting polygonal geometry (mainly quads and n-gons) are far superior to everything that you will find in a native *.3dm file coming out of rhino.