As many may know, Vectormagic, a free bitmap to vector image program from a couple of grad studects at Stanford, is transitioning away from Stanford and going to a new host. At the present time, the program is still free to use. I suspect that it will go commercial sometime this year...whether supported by ads or fee or subscription is not clear...BUT...
The new location is
VectorMagic | Precision Bitmap to Vector Conversion Online