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This is my auto rigging utility called rigTools. It's a mel script I wrote to auto-create an entire stretchy ik/fk switching rig based on user-placed locators for joint locations. Alternatively, it allows the user to add ik/fk switch-able arms, legs and spine to an already existing rig. There is also a utility in there for swapping out control objects on a rig for ones the user prefers. Definitely handy. Make sure to read the header of the script for installation instructions and such. (Just open the mel file up in notepad or text edit to read that.)

download it here!!
you can also watch a video of the script in action here