This is what I've been working on lately, to get to know how to use a phenomenal modeling program called Zbrush.
The latest incarnation of Zbrush (3.0) is simply stupefying in how natural it makes the modeling process, with the aid of a Wacom tablet realizing your brush strokes, of course. The model in this post I laid out initially in Maya, and refined in Zbrush. It was my first experience with Zbrush, thus my first official Zbrush model. The refinements made with the program would have taken ages with Maya, but can be done relatively quickly with carefully thought out strokes in Zbrush.
As you can see, the anatomy of his arms need more work, particularly the flexors and extensors of his forearms, as well as the Supinator. The anatomy of his legs are still extremely rough and have not been touched yet. I can't wait to get to them.