You could do it with Lithium Unwrap, but if the md3 has animation you would have to convert manually frame by frame! Which would be quite tedious. I would suggest getting Deep Exploration (
http://www.righthemisphere.com/products/dexp/index.htm ) if you want to do any model conversion, it is the best software that I have found for doing so!
On another note, DB Pro will eventually have support for md3 models. That is what has been promised and it IS in the features list for the product. So you just may want to wait for the next patch that adds this support.
The Yellow Jester does not play but gently pulls the strings
And smiles as the puppets dance in the court of the Crimson King.