Posemaniacs.com is a GREAT website for studying the figure!
i draw almost daily from this site-- using their 30 second poses (which has a timer and can also do 60 second, 90 seconds, etc) -- and it randomly chooses male/female poses
This site also has resources for drawing hands/heads (you can rotate the model in the web viewer, too!)
and finally-- this is available on the iPhone as a free app!
timed poses link: http://www.posemaniacs.com/pose/thirtysecond.html
random pose viewer: http://www.posemaniacs.com/pose/randomviewer.html
3D model viewer (choose from models on the Right side): http://www.posemaniacs.com/tools/handviewer/
Negative space model viewer: http://www.posemaniacs.com/pose/negativespace.html