I love Amazon.com. I do more shopping through Amazon than any other website and actually, I buy more from Amazon than most brick and mortar stores.
They have an amazing selection of things to buy. My favorite categories are movies and books. I tend to go for classics and more obscure titles when it comes to movies. If it's out there and available for purchase, Amazon has the movie. I've been able to find some amazing classic titles on Amazon that I couldn't find anywhere else.
Overall, I think it's an amazing website and I shop there often for just about anything I need.