Visio 2013 Editions
Confused by the different editions? This chart breaks down the three editions and their high level features.
Visio 2013 Feature list by edition
This chart is a feature by feature comparison helping you understand which versions have which features.
Visio Services capabilities
End user and developer training videos
Visit the Visio YouTube channel
Visio Developer Training videos and content
Visit the MSDN site for a collection of training videos and content targeted at developing solutions for Visio Services.
Developing Visio Solutions
Developers reference for shape and add-in development.
Michel Laplane (France)
Senaj Lelic (Germany)
Ed Richard (Australia)
Chris -- might I suggest you add "Visio 2013 Step by Step" and "Visio 2010 Step by Step"? Both are available from all the usual online and brick and mortar book stores.