This is a good VERY BASIC overview the Plame case for anyone who isn't sure how this started or what is going on.
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A look at what is known and unknown in CIA leak investigation
By Steven Thomma and Shannon McCaffery
Knight Ridder Newspapers, 10/14/05
Q: How did this start?
A: Former Ambassador Joseph C. Wilson was dispatched to Africa in 2002 to check a report that Iraq had sought nuclear-weapons material from Niger. On July 6, 2003, he wrote a newspaper column accusing the Bush administration of twisting intelligence to exaggerate the threat from Iraq.
Q: What did the White House do?
A: Aides apparently told some reporters that Wilson's wife was a CIA officer whose maiden name was Valerie Plame, suggesting that he wasn't selected for the Africa assignment on his merits. Wilson and others took that "leak" of his wife's secret career role as an effort to impugn his credibility as a critic of the administration.
Q; What crimes may have been committed?
A: The Intelligence Identities Protection Act makes it a crime to intentionally identify a covert officer when one is aware that the government was trying to conceal the officer's role.
and more here:
http://www.mercurynews.com/mld/mercurynews/news/politics/12905674.htm