Feedback Without Frustration (YouTube) — Scott Berkun at the HIVE conference talks about how feedback fails, and how to get it successfully. He is so good.
Americhrome — history of the official palette of the United States of America.
Discovering Talented Musicians with Musical Analysis (Google Research blgo) — very clever, they do acoustical analysis and then train up a machine learning engine by asking humans to rate some tracks. Then they set it loose on YouTube and it finds people who are good but not yet popular. My favourite: I’ll Follow You Into The Dark by a gentleman with a wonderful voice.
Dark Sky (Kickstarter) — hyperlocal hyper-realtime weather prediction. Uses radar imagery to figure out what’s going on around you, then tells you what the weather will be like for the next 30-60 minutes. Clever use of data plus software.