Opening up and letting go is not a mantra by which many managers run their business. But there's so much to win if you do it that way.... Flickr is a great example, read more here and here.
"Capturing the creative energy of the hive can be scary. It requires giving up some control, and eliminating lock-in as a strategy. This session candidly addresses what went right and what went wrong, using concrete examples drawn from the code shipped by outside developers to illustrate what opening up can mean to a startup."