I bought an Amazon Echo last week. I was looking for a Bluetooth speaker and for $100 (for Prime Members), it is a decent Bluetooth speaker, plus it integrates with Prime music, and other Amazon services. It allows you to purchase items from Amazon directly from the Echo. It also has other features like TuneIn radio, iHeartRadio, a timer, an alarm (seems like it should support more than one timer and alarm, hopefully they will add this functionality in the future), todo list, and a shopping list.
The Echo has a companion app for iOS and Android devices, and it has a web app for your desktop. I was playing around with the CSS the other day while I was off work and decided to re-theme all (or most) of the desktop app using Stylish (Chrome|Firefox).
Here are screenshots of just about every page within the Echo desktop app. Some are pretty boring, but they do show some of the elements that have been changed on the page.