Hi cjwidd, what areas are you trying to fillet?

One thing that would give it a better chance for filleting is if your model was constructed out of more simple pieces, for example this surface here is planar but instead of it being a simple 4 point surface plane that's trimmed, it instead has a whole ton of surface control points:





It looks like you may be trying to start your model by getting 3D edge curves in place and then building surfaces from those - instead with NURBS modeling you want to try and construct as much of your model as you can by using 2D curves directly rather than patching in surfaces between 3d curves. See here for some tips for people coming from a poly modeling background: http://moi3d.com/forum/index.php?webtag=MOI&msg=4865.2

- Michael