Craft Rig by Tiago Beijoco

I think I missed this one when Tiago Beijoco posted about it on Si-community (in January). It's a very sweet, customizable rig. It works similarly to the Auto-Rig built into Softimage but sports extra features like stretchy limbs and spine. You choose the numbers of elements required for each part of the rig and then a script builds it for you.

You can download directly from here or check out his website for a video about it.