Three-tiered interview process, all with standard interview questions. Not too many curveballs. The first is a telephone interview with a recent hire who has one year's experience in the position applied for from the local office (and has transferred to HR). Second is with a senior HR manager and may be from another office located somewhere else in the US. If you pass both interviews, you'll get to tour the facility with a group of candidates. Get there 5-10 minutes early so you don't leave the group waiting. There will be a brief presentation about the company by a senior manager, followed by the tour and finally, an interview with two hiring managers.
It was a great experience, that I unfortunately blew, as it was my first serious interview in a long time. I've applied numerous times since and will continue to apply until I get it, or something better. This had the feel of a great place to start a career.
They were incredibly kind, helpful, and understanding. If you don't have a lot of experience in customer service, you probably won't get the job, though. If you're fresh out of college without a background as a CSR, work for a while in retail or another customer relations-job first.
They are incredibly candid and helpful in letting you know precisely why they pass you over; and you'll have tons of time to prepare for the interview. Use it.