Growth Hacker Marketing - Ryan Holiday's book, re-released and expanded
CS183B - Startup Class - Stanford class taught by Sam Altman & guest speakers
TweetFavy - The Growth Hacking Tool for Twitter. Marketing automation software / Growth Hacking tool designed to grow your social media influence and attract real, targeted and engaged Twitter followers.
Classroomies - Watch Stanford CS & Startup lectures together
Primer - CSS toolkit and guidelines that power GitHub
Apply to YC (Y Combinator) - Curated collection of resources for founders applying to YC.