[mazumdar]

Surprised that neither of these have been mentioned yet.

https://squareup.com/

https://nest.com/

I especially love their mobile responsiveness and have modeled our own after them:

http://yathletics.com

[DiabloD3]

The thin font on Y Athletics used for "A Revolutionary Shirt" and "The Odorless Sock" is too thin to read easily. I suspect they may have not tested on all types of displays.

Web developers, no matter what platform you like, ALWAYS test your thin fonts on as many platforms as possible and make sure it is easy to read.

[Kiro]

http://yathletics.com/ is not working for me.