I've been meaning to mention this for a while.
Sex, Lies & Book Publishing is an insider's guide to getting published, written by UK literary agency Rupert Heath.
Sex, Lies & Book Publishing is a field guide to the nature of publishing – the unspoken rules and conventions deciding which books get published and which don't. It is an up-to-date insider's guide to an often mysterious business, and an invaluable resource for any author seeking an agent and, ultimately, a publishing deal.
Along with the Writers' & Artists' Yearbook, it was one of the first things I read after I'd finished writing my debut novel.
It's packed full of useful information, and at only £1.99 it's an absolute bargain.