My latest book, which is about validating diagrams in Visio 2010 ( https://www.packtpub.com/microsoft-visio-2010-business-process-diagramming/book ) was published by Packt Publishing last year.
You can get 25% off during January, if you buy more than one Microsoft book from them. Please read the details at https://www.packtpub.com/article/microsoft-books .