I applied online. The process took 2 months. I interviewed at Eastern Cooperative Oncology Group (Boston, MA) in Nov 2011
Interview
Basic and straightforward. You'll get a phone call/prescreen interview. If that goes well, they'll invite you in. You'll interview with 2-3 people who will ask really standard "interview" questions. Afterwards, they'll check your references if they like you, and you'll know within a week or two.