The new field of infographics is new and expanding rapidly not only in scientific fields from whence it emerged but in communications generally. Below is a quick definition from the Wikipaedia entry for infographics. The entry is detailed and offers a good background on the field.
Information graphics or infographics are graphic visual representations of information, data or knowledge. These graphics present complex information quickly and clearly, such as in signs, maps, journalism, technical writing, and education. With an information graphic, computer scientists, mathematicians, and statisticians develop and communicate concepts using a single symbol to process information.
Visual.ly is probably the most interesting on-line site. It actually does what it says it does
.... helps you create beautiful data visualizations in minutes and instantly apply the stylistic genius of the world's top information designers to your designs. Plug and play, then grab and go with our push-button approach to infographics and data visualization...
Visual.ly also has a great blog.