They mostly followed a normal "Google" style interview. One guy asked me questions specific to the technology I'd be working with.
I had two phone interviews, one was more about my experience, the other was code-heavy. The on-site in Palo Alto had 5 interviews, two of which had "shadow" interviewers that sat quietly and took notes.
I did very well in four of them, and didn't do so well on the fifth one. Didn't get the job, which was disappointing, because I really kicked major butt on the first four. They let me know two business days after the interview.
The team and manager seemed really cool and great to work with. Their work hours were sane, and standard according to silicon valley (around 50 hours per week including lunch time). The perks are almost non-existent at Amazon, which is a bit annoying. If devs stay late, they should be given dinner, this should be the norm in software jobs... after all they just cut into their dinner prep plans, right? Spend the $7 on them for the extra hour ($50+) or two ($100+) they put in.