I am both an author of a number of books on supply chain and IT decision making books, an independent consultant who often focuses on SAP as well as other best of breed applications. I also manage Software Decisions, a paid analysis site and training company.
A list of my books is the following: http://www.amazon.com/Shaun-Snapp/e/B003CY62D0
Here is the website of my publishing company SCM Focus Press.
Software Decisions is both a customized training company and on line site which publishes leading edge analysis that improves IT decision making.
SCM Focus is one of the top websites that covers supply chain software.