SubscribeDittoing everything penchant said, and adding that professional editors (of which I am one) would likely find such a service seriously annoying, because it encourages the idea that writing, editing, and proofreading are not activities that one should be paid for.Dittoing everything occhibiu said.
Oh, to answer the first question, I'm not aware of such a service now existing.
posted by KAS at 12:19 PM on August 8, 2006