An entire design approach laid out
There are some great UX/UCD resources online — my favourites to date have been Service Design Tools and more recently UX Mastery. But today I was knocked out by the phenomenal effort to define and encapsulate design research activities in a cohesive project framework. It was all revealed by a rather innocuous tweet that did not quite foretell the brilliance ahead.

The CFC Medialab in conjunction with Professor Suzanne Stein of OCAD University have produced a comprehensive user research and design resource for the UCD community. Unsurprisingly hundreds of people were involved in the creation of this repository. Go check it out: http://designresearchtechniques.com/#/