See
Visual Hint at http://hint.fm/blog/
Visual Complexity at http://www.visualcomplexity.com/vc/
A periodic table of visualization methods at http://www.visual-literacy.org/periodic_table/periodic_table.html
Edward Tufte at http://www.edwardtufte.com/tufte/
The Simple Complexity gallery at http://simplecomplexity.net/visualization-gallery/
Information Asthetics at http://infosthetics.com/
The Processing exhibition at http://www.processing.org/exhibition/
A gallery of art using Context Free at http://www.visual-literacy.org/periodic_table/periodic_table.html
The Matplotlib gallery at http://matplotlib.sourceforge.net/gallery.html
The Pure Data gallery at https://gem.iem.at/
Eigenfactors at http://well-formed.eigenfactor.org/index.html
A site with a good discussion on how to present charts at http://www.excelcharts.com/blog/data-visualization/
A gallery of MayaAVI capabilities at http://code.enthought.com/projects/mayavi/docs/development/html/mayavi/auto/examples.html
A really cool site – www.datamasher.org