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"I noticed that both Cooper and Miller refer to "sources" - plural. I wonder what's up with that."

Miller went to jail to protect these "other" sources, not to protect Libby or Rove. That is apparent because she agreed to testify after the SP agreed to limit his questions to Libby. I've assumed that she will not reveal these other sources because (1) they have not given waivers and (2) revealing their identity would prove extremely embarrassing to Miller, the NYT, or the sources themselves. Since Bush demanded waivers of all his staff, these other sources are therefore not currently employed by the government, or at least by the White House. Thus the sources could be other media people, government employees other than WH staff, or even Plame or Wilson themselves.