Juhan Sonin gives a brief talk at O’Reilly Ignite about creating a practitioner’s guide to UI Design. The fast-paced talk speeds through many great tenets such as “Let Data Scream”, “Repeat Users Rock”, “Bitch Loud and Often”, and many more. For a more detailed look, check out his longer talk given at O’Reilly OScon, and also be sure to check out his ever-expanding website of publicly contributed design tenets.