I've been playing with the website You Write On, and found it really helpful, as long as you bear in mind the limitations of some of the reviewers. I put two first chapters up in 2007, before I really started studying writing again and had some very helpful reviews. You can use their self-publishing arm (which is just an attempt to improve vanity publishing, I think, as it bypasses all suggestion of peer review) but the main draw is that the best chapters are reviewed by real editors.
Activity 3.7 in A363 quite comically takes a few lines from the opening speech from Under Milkwood:
It is night in the chill, squat chapel, hymning in bonnet and brooch and bombazine black, butterfly choker and bootlace bow, coughing like nannygoats, sucking mintoes, fortywinking hallelujah...
and translates it into:
The chapel is small and cold and dark, but somehow sounds as if the congregation of women are in there, despite it being night-time.
The task is to gather some prose, de-dramatise it, then return to it a few days later and re-dramatise it!