Have you seen the wonderful wood routed panels on Flickr at
http://www.flickr.com/photos/angelicdiablo/2601479294/ They apparently took 4.5 hours to route with a 0.125 inch ballnose using the ShopBot router.
Vector Art 3D have an evaluation version of their software at
http://www.vectorart3d.com and a couple of sample files to cut.
I could not resist downloading their software and giving it a try this morning and here is my first attempt in MDF. Somehow VectorArt manage to remove the tool marks from their examples, perhaps I would get better results in hardwood as MDF is such awful stuff anyway. This example is approx 150 mm in diameter by 4 mm deep and took me approx. 45 minutes to complete.