BookTrib is a new, US-based aggregator which claims it is "the place where you can find all the book news that matters from all over the web. It’s also the home of The Great American Book Giveaway, where every week you can win books -- free books -- no strings."
At the moment, all the links on their homepage seem to be to the Complete Review's Literary Saloon, but presumably they'll get this sorted:
BookTrib is the result of our endless searching for book news, reviews, and gossip. We yearned for a single place, a starting point, where we could find all the book news as it’s updated, all the time. That’s what BookTrib is, an aggregator that gathers the best, the most outrageous, the most fun, informative, and creative blogs that relate to books and puts them all in one easy to find place.