You can use the sites below to extend your knowledge or develop more complex data visualizations.

Data Sets

Many sites offer access to data sets you can use to practice with or mash with existing data.

Koordinates is your one stop shop for geodata: satellite images, transportation, utilities and more.
At the Data Market, you can access "100 million time series from the most important data providers, such as the UN, World Bank and Eurostat."
Semantifi provides access to datasets found within the deep Web, enabling users to "ask simple questions or keywords to search multiple databases, get relevant answers, see automatic data visualizations in real-time even from multi-terabyte databases."
At Ed Data Express, you have access to "some of the important data that the U.S. Department of Education collects from the 50 states, the District of Columbia, and Puerto Rico."
Make use of Google's Public Data Explorer to gain access to a wide variety of sets.
The Data Masher has a variety of public data sets that you can use for creating visualizations.

Video Resources

Information by MAYAnMAYA . "This is a short film...about information. Although most of us think we know what we mean when we say 'information,' we sometimes confuse the medium with the message."
A good place to start is this TED talk by Tom Wujec on Three Ways the Brain Creates Meaning. "Information designer Tom Wujec talks through three areas of the brain that help us understand words, images, feelings, connections. In this short talk from TEDU, he asks: How can we best engage our brains to help us better understand big ideas?"
This TED talk by Chris Jordan highlights the affective value of using visualizations over statistics. "Artist Chris Jordan shows us an arresting view of what Western culture looks like. His supersized images picture some almost unimaginable statistics -- like the astonishing number of paper cups we use every single day."
Alex Lundry recently described the Chart Wars happening in politics and the importance of "graphical literacy."
And my personal favourite: Little Red Riding Hood, retold only through visualizations: Slagsmålsklubben from Tomas Nilsson on Vimeo.

Inspiration

Sometimes, you just need to see the possibilities. Other times, you need models and examples. The links below are ready to play Muse and provide you with the inspiration you need. You can also check the Connect with Others page for blogs and Flickr sets to view.

Information is Beautiful awards
Paper-Based Visualization Competition: The Winners and More
Visit the Feltron Project to see beautiful the "annual reports" one man posts about his life each year.
Examples of incredible visualizations on a variety of topics are available from Visual Complexity.
One Book, Many Readings provides visualizations analyzing Choose Your Own Adventure books.

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