UX Challenges - Done reading about UX? Start doing it.
StartupTalks - A curated collection of startup related videos and podcasts
Uxcel - The easiest way to learn UX/UI design
Vooza - Hilarious videos about the BS of startup life
uxtoast: Learn UX Design - Become familiar with design laws and learn how to use them.
Talks by UI Patterns - A library of talks by UX experts