Amazon is quite a bit more than 'an internet shop'.
Amazon is pretty unique in that they make a lot of their internals available as products, but even before that, the infrastructure was still impressive. What other online store do you use? :)
But of course, i probably use Amazon for 80% of my online shopping needs, they rock!
MS seems to use Dell (only link i could find): http://www.datacenterknowledge.com/archives/2008/10/28/dell-...