Just found out that Potrace was updated a few weeks ago. A few cool tweaks and I did update my batch file a little. Thought I would share the news since I was unaware of this update.

http://potrace.sourceforge.net/

I wonder when Inkscape will add the new Potrace version?
While were on the subject of Potrace have you read, Tracing Color Raster Images?

Never heard of pnmremap. I use Autotrace but it really doesn't do a good job at curved tracing imo.

I don't use pnmremap, I just thought the methods at the Tracing Color Raster Images link were interesting and good to know.
If anyone has FontForge you can update the version of Potrace it includes.