A number of relevant organizations and resources are provided below.
Microsoft Visio Toolbox
Visio Insights Blog
Mai-lan's Visio Blog
Visio Guy's Visio Blog
Bill Morein's Weblog: Visio and Data Visualization
Microsoft Visio 2007 Training Courses
Microsoft Visio 2003 Training Courses
Download a trial copy of Microsoft Visio 2010
Templates and Stencils from the Microsoft Visio website, Visio Cafe, Shape Source, Visio Guy (Network Stencils).
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Valuable information and resources to help your team's projects
Visio Starter Packs
Free Visio Stencils
White Papers
Videos
Presentations
Posters
Reports and Publications
Case Studies