Microsoft Visio is a very powerful tool and may be used for many time saving and diagramming activities besides the common flowcharting for which it is employed. For example, are you aware of the Visio ShapeSheet and the information and opportunities it provides?
Because so much of the functionality of Visio is hidden (or not as obvious as with other Microsoft Office applications) I find it beneficial to subscribe to the RSS feeds of some of the better Visio Blogs. Visiting these blogs adds greatly to my Visio competencies and, more importantly, an awareness of the capabilities of Visio.
The Visio Blogs to which I subscribe are: