Today I brought in an iPhone 3g whose microphone wasn't working to the Nashville Apple Store.  They checked it out, it was really broken, and they gave me a new one with no questions.

In May, I brought in a MacBook with the K,I,L,J keys not working.  They checked it out, took it into the backroom, told us it could take 24 hours, called 30 minutes later that they had replaced my built-in keyboard and I was ready to go.

So awesome!