Useful Organisations to Help You Declutter
Mailing Preference Service: reduce your junk mail.
For selling books and CDs.
For selling practically anything.

Useful Charities For Unwanted Items
Regularly collects scrap materials from Simply Sorted for distribution to schools.
Sends computers to African Schools.
Sends tools and manual sewing machines to developing countries e.g. woodworking, blacksmithing, building and plumbing tools.
Sells secondhand books, sheet music, CD's, records and videos in aid of Amnesty International. Will collect large quantities of books.
Very useful column - 'Free to Collector' for large items.

Other Resources
Greg Cooper, a good coach and mentor.