Just found out that there is no "Resources" board in the forum.
Despite it was not needed in all the years the forum existed, I think it would be a nice place to post founds for stencils, tutorials, etc.
Here is one of such founds. A summary of Visio 2010 new features.
http://www.milestoneconsultinggroup.com/visibility.biz/Shared%20Documents/David%20Edson%20-%20Visio%20Tips%20and%20Techniques%20Resources%20for%20Public%20Use/VISIO%202010%20Tips%20and%20Techniques%20Handouts.pdf
At VizFirst site you can found more articles (http://vizfirst.sharepoint.com/Pages/DownloadableDocuments.aspx)
That's a nice one. Thank you.
Also, in our russian visio forum (https://translate.google.com/translate?hl=ru&sl=auto&tl=en&u=http%3A%2F%2Fvisio.getbb.ru%2Fviewtopic.php%3Ff%3D5%26t%3D750) we collected some same links in thread English-speaking resources and blogs about Visio (https://translate.google.com/translate?hl=ru&sl=ru&tl=en&u=http%3A%2F%2Fvisio.getbb.ru%2Fviewtopic.php%3Ff%3D24%26t%3D314).
Just discovered M$'s help and documentation site on GitHub: https://github.com/OfficeDev/VBA-content/tree/master/Visio-VBA (https://github.com/OfficeDev/VBA-content/tree/master/Visio-VBA)
Worth checking out.