This presentation is from a talk I gave at the spring 2012 DevConnections conference. It covers some of the key topics you need to know to get started building Windows 8 HTML/JavaScript Metro apps including navigation options, UI surfaces that can be used, controls, data binding and templates, and animations.
View more of my presentations
here.
Sample code shown in the presentation can be
found here. A large number of samples are available in the Windows 8 SDK which can be
found here.