http://smalltalkhub.com is not only a new website for Smalltalk. If you look at the bottom of the page you will notice that is based on Pharo, Seaside, MongoDB and also the client side Amber Smalltalk that helps running the nice looking pages.
to open the Amber class browser. It is very nice to see the classes in Hub-Amber-... categories and I like how easy one can understand and encapsulate client side rendering.
Hope to find some time to dig deeper into Amber especially after Nicolas has some nice ideas to push Amber.