Here are a few resources that you’ll want to keep handy for your users.
APP: Windows 8 Handbook
http://apps.microsoft.com/windows/en-US/app/windows-8-handbook/283f362e-b936-448f-8379-b66a39698dd9
GUIDE: Windows 8 Quick Reference Book (11.8MB, PDF)
http://www.oemsalescenter.com/ConLib/CustomizerControls/create.aspx?T=&PID=38787&catid=d39e1c00-7c1e-409d-afde-360a607f312d
BOOKS: Windows 8 Plain & Simple (And other MS Press books)
http://shop.oreilly.com/product/0790145338945.do
REFERENCE: QuickStart Card for Microsoft Windows 8 ($4.95)
http://www.brainstorminc.com/for-business/train-by-product/microsoft/windows/windows-8