Robin, it's more of a beware piece, but you might want to have a look here
http://howpublishingreallyworks.blogspot.com/2009/01/manuscripts-display-sites.html
if you're in need of some tips for your readers of what some of the sites can and can't do...
MNW is more of a slightly unusual model of conventional publishing, I'd have said, which is a rather different thing from those manuscript display sites.
Mentoring's different again. I think some local Arts Councils have competitions/sponsorships - I think I'm right in saying that some have teamed up with Adventures in Fiction to provide mentoring:
http://www.adventuresinfiction.co.uk/mentors/
Literature Training should have a fairly comprehensive run-down of possibilities too:
http://www.nawe.co.uk/metadot/index.pl?op=show&iid=2382
Emma