Historical version 2 of Apple Store (view current version)
The Apple Store opened on November 20th 2004. I'm here now, acually. It stocks all of Apple's products, as well as some other Apple-related products.
As well as stocking Apple products, they have a Genius service, where you can book a slot to have one of their techs look at a problem and either fix it or tell you how to get it fixed. The slots seem to fill up fairly quickly, but they run to late at night.