Axure - The most powerful way to plan, prototype and hand off to developers, all without code. Download a free trial and see why professionals choose Axure RP 9.
StartupTalks - A curated collection of startup related videos and podcasts
Balsamiq - Balsamiq. Rapid, effective and fun wireframing software.
Vooza - Hilarious videos about the BS of startup life
Moqups - The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project
Talks by UI Patterns - A library of talks by UX experts