I just discovered this fantastic site:
that does what it says on the tin - you read a book and then you swap it for a new one (well, second hand but new to you) and it only costs 90p in postage. Now I know what to do with the enormous pile of books I've got at home that I've been meaning to get rid of for ages.
Only one problem - I was trying to get rid of the books to clear more space in my flat. If I swap each one for a new book I'm not going to clear out much space am I?
Ah well, I'll just swap a few *coughs* honest.