Alex Mann is a 3D Rigging and Character Artist who regularly shares some of his workflow scripts. The most recent one is simply called Rigging Dock. It is a bunch of scripts and procedures that Alex wrote for simple and common rigging tasks in Maya, collected all on one place. As the name suggests, the panel can be easily docked into the Maya UI.
Mann walks through the script, which looks to be a feature-rich panel, making commons-use tasks fast and easy. The dock has sections for dealing with object position, transforms, control colors, attributes (adding and removing), and an area for making nodal connections, all in one place. Rigging Dock can be had for free.