I recently launched my side project I've been building with Meteor js over the past few months.
It uses the Soundcloud, Hypemachine, and exfm public APIs to pull in your 'favorite' tracks from each of your usernames provided. It's gives you a unified playlist of all your favorite tracks across the different sites.
Audio is being played using the HTML5 Audio API, which currently only works in webkit browsers (Chrome & Safari).
Checkout Bourbon–a library of SASS mixins and variables. It aims to be very vanilla, so you'll write the mixins similar to plain CSS. http://thoughtbot.com/bourbon/