I applied through other source. The process took 12 months. I interviewed at U.S. Department of State (Washington, DC) in Aug 2011
Interview
Applied by email after Peace Corps Career Fair. First interview by phone, second in person with deputy director. Make sure you ask questions to both interviwers I think they liked that. There was a very lengthy security clearance processs.
Interview questions [1]
Question 1
Situational Interview Questions for first, more personal questions for second which was very short.