Chris, you've been in Germany too long. It's "Wideman"
Two other sources of information are:
"DVS" - Developing Visio Solutions. This is the document that came with
Visio either as a book or as an Acrobat file (pdf). It was last published as
a Microsoft Press book "Developing Microsoft Visio Solution" for Visio 2002.
It is also available online at the MSDN website.
"Professional Development with Visio 2000" by David Edson, Sams Publishing.
Though there have been two other version of Visio released since Visio 2000,
this book still covers the basics.
Graham's books are must have books for Visio fanatics, but he starts off at
a deeper level of detail. DVS could be consider the preamble to his book(s)
Other references can be fould at
http://www.mvps.org/visio/Information_Sites.htm
John... Visio MVP
Need stencils or ideas?
http://www.mvps.org/visio/3rdparty.htm
Need VBA examples?
http://www.mvps.org/visio/VBA.htm
Common Visio Questions
http://www.mvps.org/visio/common_questions.htm