It's getting hard to keep track of the US intelligence community leakers without a scorecard. So here's my attempt:
Leaker #1: Chelsea Manning.
Leaker #2: Edward Snowden.
Leaker #3: The person who leaked secret documents to Jake Appelbaum, Laura Poitras, and others in Germany: the Angela Merkel surveillance story, the TAO catalog, the X-KEYSCORE rules. My guess is that this is either an NSA employee or contractor working in Germany, or someone from German intelligence who has access to NSA documents. Snowden has said that he is not the source for the Merkel story, and Greenwald has confirmed that the Snowden documents are not the source for the X-KEYSCORE rules. This might be the "high-ranking NSA employee in Germany" from this story -- or maybe that's someone else entirely.