Zynga has a great interview culture - one of the best I've ever been exposed to. Things started with a call from an internal recruiter, who had been poked by a friend of mine. He arranged a phone screen, which served as a poseur filter ("Reverse a linked list!", "DFS a tree!"), and was efficiently conducted. I was brought in just a few days later for in-person interviews, which worked through issues at the operational ("How would you handle proactive hardware provisioning for a giant web application?"), strategic ("Sketch a million-user presence system!"), and tactical ("Implement a distributed hash table!") levels. Every interviewer was on-time and showed evidence of having read my resume and thought it through. That level of preparation warmed my heart, since I had been the "tech interview guy" for years at a previous employer, and finally got a little karmic reward.