Here is a pair of resources to help with data visualization efforts.
1) http://www.visualizing.org/ is ". . . a community of creative people making sense of complex issues through data and design. . . and a shared space and free resource to help you achieve this goal."
One can (see http://www.visualizing.org/about)
Most important and useful (to me, anyway) is http://www.visualizing.org/explore, which affords multiple ways for one to browse for and get inspired by great examples of visualizations. Browse by
2) http://flowingdata.com/ is less elaborate -- it is more an individual's pursuit; its creator, Nathan Yua, blogs about and collects good examples of data visualization -- and has more accessible tutorials.
williamgarrity
Just came across this: http://mashable.com/2013/03/05/data-visualization-projects/