Stephanie Evergreen's website and blog provides ample reading and guidance on data visualization techniques, taking a research-based approach to effective communication of ideas.
The Dashboard Insight website contains a number of useful articles, examples and guides on the subject of Organizational Dashboards.
Jason Davies' website contains a large number of data viz examples, particular around geo data. It also contains some links to to tools, including a word cloud and tree map.
Claremont Evaluation Center's Professional Development Workshop Series in Evaluation and Applied Research Methods
Workshop: Seeing is believing: Develop your data visualisation skills to communicate effectively and facilitate decision making
An infographic (information graphic) is a way of representing data visually so that the information is able to be quickly and easily understood. Infographics make display the big picture in a simple manner, and can tell a story or message and highlight data patterns, relationships and changes over time.