One of my favorite resources for photography is a site called
PhotographyTips.com. It has ways of posing models, how to pose them, lighting, links to other resources, etc.
I was amazed at how much useful info it had. One of my favorites is
A guide to posing female models. Scroll down to the bottom for the posing guide.
If you know of any other sites that are similar with a lot of reference photos, please share with me.