There are no smoothing groups in Maya (only soft and hard edges). Try Normals > Unlock Normals, and if there are still any hard edges, Normals > Soften Edge.
@sonic: It looks so soft, almost a bit translucent. Is that a shader your suing to get that effect, or is it all in the texturing? Either way, nice stuff!
There's a checkbox in fastsss shader rollout saying 'screen (soft) compositing of layers' You need to either turn it off or on, I don't remember precisely.
Try Blender, then import your model in Milkshape to export a .psk using the following tutorial http://www.swissquake.ch/chumbalum-soft/ms3d/tutorials/ut/