I picked up "People and Poses" by Buddy Scalera as a drawing reference last week. It's been very helpful! It was compiled for comic book artists and contains shots from 4 models (2 men and 2 women) in a variety of poses ranging from standing to guns and swords to flying. The poses are dynamic and the guns/swords ones use props, which are very helpful. It does a good job of covering poses from various angles including above and below. The book also includes a CD with digital images, which is very useful.
The problems: some of the images in the paper book are included in the CD but most aren't and it's frustrating to pick a reference image then search through the CD only to find that it's not there. The book cover says there are over a thousand images and although I haven't counted it really seems like there are fewer than that, unless they're counting the thumbnails too. Some of the poses on the floor could have benefited from using a transparent balance ball like the one used in the "Virtual Pose" books.
But in the end, it's a very useful book with a wide variety of images.