A mate of mine tried creating a biz out of this a few years back. it had a lot of competition and it was hard to monetize. it shuttered after a bit.

I've seen a few others take up the gauntlet with webbased pdf converters including developer api's.

The only one that i know that is surviving is http://www.nitropdf.com/

they seem to have quite a few government/big companies using their product.