a "Pro Care" service plan which costs $99 per year, and supposedly gives you faster service at the Apple Store, but when I was sitting there waiting I did chat with a couple of people who had the Pro Care and they still had some waiting time. More details on that are at
http://www.apple.com/retail/procare/ This is in addition to the "AppleCare Protection Plan" they offer, the price of that varies from one computer model to another. Before your regular warranty expires you might consider buying that "AppleCare Protection Plan," as it could potentially save you hundreds of dollars in repair costs if you ever need it. It's up to you, but I think it's well worth it.