Christine Borgman has a lengthy track record of saying smart and apposite things about scholarly communication and research data. (See my review of her 2007 book here.)
She has done it again, in a conference paper entitled "Research Data: Who will share what, with whom, when, and why?" If you liked my Ariadne article at all, you will love this, I guarantee it. Strongly recommended, so much so that I didn't want to wait for the next tidbits post.