500 Poses for Photographing Full Length Portraits by Michelle Perkins

Of course there are some great images in this book. I think it'd be great for when you feel like you're in a posing rut and need some inspiration. It covers a lot of different portrait areas too. It has bridal, vintage, senior, mens, glamour, maternity, etc. It doesn't include kids but she has a whole other book for that anyway. There is a section at the back on basic posing guidelines as well and bios on all the photographers.
Find it here:
Amherst Media
Amazon
Barnes & Noble