VMware have very kindly made available the following ebook:
Digital Workspace Basics, written by Kevin Strohmeyer
The introduction is as follows:
"The digital workspace fundamentally transforms the way IT delivers end-user services to employees and contingent workers. A digital workspace provides the necessary infrastructure for your employees to securely access the applications and data they need on any device used for work."
This is a small book, only 6 pages, but still worth a look at.