text summarization is a service, a few places offer it, like summly. you can also build it using libOts, for example.
here's a coaching service (which, of course, costs money):
http://www.aliventures.com/coaching/
i found that one by googling for "writer coaching service -resume" (the last piece gets rid of the plethora of people who will only help you write a better resume).
have you studied Strunk's "Elements of Style"? well worth it if you have not. cheaper, too.