John Crace's 'The Digested Read' in The Guardian are marvellous parodies of the style of the book under review and its content: I think I would have enjoyed this more had I read more the the books but having read the brilliantly sarcastic reviews there is little to tempt me to read any of them. You can find him here.
This collection of Crace's reviews from The Guardian are snarkily funny even if you haven't read the book. If nothing else, Google his name and check out his work on the Guardian website.