At first blush, America's favorite sandwich might seem like a limiting subject for a blog. But for more than six years, the hungry people at Serious Eats' A Hamburger Today have been showing that it's an infinite wellspring of inspiration. They review new burgers (usually, but not always, composed of beef) and keep tabs on news from local joints, up-and-coming chains like Smashburger and the Hardee's and Jack in the Boxes of the world. If you have a strong opinion on the question "Are onion rings an acceptable burger topping?" you'll feel right at home here.