I thought I’d put together a list of the interesting Windows 8 Sessions at Build so you can use it for your self-study.
Most of the sessions are 1 hour in length.

If you want to see all of the Windows 8 Sessions then this link will help you.
http://channel9.msdn.com/Events/Build/2012?sort=sequential&direction=desc&term=&t=windows-8

I hope this helps.

TITLE

URL

Designing Games For Windows 8

http://channel9.msdn.com/Events/Build/2012/2-106

Developing a Windows Store App

http://channel9.msdn.com/Events/Build/2012/3-125

Powering your Apps with Microsoft Accounts

http://channel9.msdn.com/Events/Build/2012/3-138

The Microsoft Design Language

http://channel9.msdn.com/Events/Build/2012/2-116

Core Technologies for Windows 8 Games

http://channel9.msdn.com/Events/Build/2012/3-107

Tips on self-evaluating the UX of your app

http://channel9.msdn.com/Events/Build/2012/2-118

Windows Store: How does it work?

http://channel9.msdn.com/Events/Build/2012/2-120

Developing a Windows Store App using DirectX and C++

http://channel9.msdn.com/Events/Build/2012/3-109

Performance tips for Windows Store Apps using XAML

http://channel9.msdn.com/Events/Build/2012/4-103

Performance Tips for Windows Store Apps using Direct X and C++.

http://channel9.msdn.com/Events/Build/2012/4-102

Deep Dive into WinJS

http://channel9.msdn.com/Events/Build/2012/4-101

Building mixed-language Apps

http://channel9.msdn.com/Events/Build/2012/4-100

Writing Window Store Apps with JQuery

http://channel9.msdn.com/Events/Build/2012/3-130

Top Tips for iOS devs building Windows Store Apps.

http://channel9.msdn.com/Events/Build/2012/3-128

Diagnosing performance and memory issues in JavaScript-based Windows Store Apps

http://channel9.msdn.com/Events/Build/2012/3-008