this collection of more than 100 ebooks about Microsoft products. In the collection you can find ebooks on everything from Windows 7 & 8 keyboard shortcuts to programming Windows Store apps.
Applications for Education
A few of the ebooks in this collection that might be of interest to educators are BYOD Devices - A Deployment Guide for Education, Getting to Know Office 365, and Windows To Go - A Deployment Guide for Education (all links open PDFs).
H/T to Lifehacker.