Standard recruiter-phone screen-onsite. As with most tech interviews, rigorous whiteboarding preparation will serve you well. There was a few coding sessions, an architectural session, and two top-level soft sessions.
My whole experience with OpenTable was excellent - the team is very approachable and interesting to talk to, lots of autonomy on the projects, great location, and a robust product and product vision. I ended up declining the offer due to unrelated factors but it was a tough decision.