Try www.vectoreye.com
It is not freeware, but makes the output in vector.
Vector-like / Comic-Artl-ike Plugin/Filter [Requested]
This is a free OpenSource program that does a decent trace bitmap:
Inkscape
:Edit:
Also Adobe's Streamline
Belive it or not, I did the Streamline demo, and liked the free Inkspace better.
Inkscape
:Edit:
Also Adobe's Streamline
Belive it or not, I did the Streamline demo, and liked the free Inkspace better.