NBC posted this list of the hottest books this spring
Here is the Indie-Bound Next List for April
Check out Amazon's Spring Reading Guide
For those who want a broader view, check out Early Word's links to the major publisher's Spring/Summer catalogs.
Also, don't forget BookBrowse's List of Current Books. This list will help you identify the hottest books in hardcover as well as those new in paperback. It is updated frequently too, so you can always bookmark it and check back when you are looking for your next good read.