Windows 8.1: Free ebook

These books are usually VERY good.  I have read a number of them in the past and they provide a good depths of knowledge while covering the new features.  It is a great way to get to know the newest tech.  If this  is up your alley here are a few other links to check out:

CanITPro is one of the premier sites to learn about Microsoft technologies and they recently posted a series of free books as well –

Here is a third option for free books.  It is a HUGE list of the available free Microsoft books –