Wilson Miner - When We Build: http://vimeo.com/34017777 I personally can't see this one without becoming misty at the end. Yes, it's that emotional.

Aral Balkan - A happy grain of sand: http://www.besquare.me/session/a-happy-grain-of-sand/ He did this talk at various conferences in various variations. Some extremely good thoughts in how to use our skills to make better products and thus making lives better for everyone. Aral is probably one of the most inspiring people I ever had the pleasure to listen to, and partly thanks to him I sure as hell wasn't on the path I am on today.

Bret Victor - Inventing on Principle: http://vimeo.com/36579366 Powerful talk on designing and developing and essentially living your life based on guiding principles. Still gives me goosebumps.

Joe Stewart @ Creative Mornings Los Angeles: http://vimeo.com/58672952 A good designer friend of mine suggested this one. Incredible good talk on design and inspiration and not giving up when it seems people don't give a damn about your work. Note: some profanity ahead.

Ben Chestnut @ Creative Mornings Atlanta: http://vimeo.com/34081566 Great talk on what makes Mailchimp tick and makes the company so succesfull; It's about creating a creative culture and the environment in which creative minds can thrive.

Already asked before twice (more or less), so you'll find lots of great ones here:

https://news.layervault.com/stories/267-ask-dn-most-inspiring-design-bookshttps://news.layervault.com/stories/1777-ask-dn--great-books-about-design

Any sans will do I guess. But what you're basically asking is "what do you think is the best sans font". That depends on a whole lot of factors, including personal taste so you will probably get tens to hundreds of answers. Just go to any typography shop, check out the choices and see what fits into your design.

http://www.fivesimplesteps.com/products/the-icon-handbook is all you need :)

Hi, I am pretty sure you are talking about an app made by Bohemian Coding called SlipCover. Unfortunately it seems Bohemian Coding dropped SlipCover and has put all their effort on Sketch and Fontcase instead.