Folk who like to read and review stuff ahead of publication might be interested in this just-launched site.
Once you’ve signed up (and constructed a not-too-obviously-bogus persona for yourself) you can request proofs (ie ebooks) from a whole range of publishers including Bloomsbury, Penguin, PanMacmillan, Fourth Estate, Granta, Canongate etc etc. You have to be approved by the publisher whose book you’ve requested, and you have to say where you’re going to post a review, but I would have thought several hundred committed book-buyers on the Afterword would constitute a fairly convincing demographic.
So give it a go if you fancy it.