A colleague shared with me a list of other free ebooks from Microsoft Press, that you may find useful too. Many of them are quite technical, so they won't be for everybody. I bet there are some colleagues around you that would appreciate this list:
Personally, I haven't read them all - but I have read the Understanding Microsoft Virtualization Solutions book - mainly to make sure that I can keep up with some of my more technical colleagues and customers, and to understand what the true potential can be in different scenarios.
Find all the other 'Free Download' posts on this Education blog