I love the mechanics of interviews, especially the "Microsoft Interview". The two best references I know of are How Would You Move Mount Fuji? and Programming Interviews Exposed. If you come for interview at Exony - be prepared for questions like these.

For a personal view of the Microsoft process, you can't beat Aaron Boodman’s account. His description of the screening process includes a telephone step with a developer where he asks you a programming question and you have three minutes to e-mail him back the solution. I think this is a great way to get some code out of a candidate before they have to come to the office.