The Visualizaing Data book from http://oreilly.com/catalog/9780596514556/ http://oreilly.com/catalog/9780596514556/ is a good easy way to jump into processing.

The Visualizaing Data book from http://oreilly.com/catalog/9780596514556/ http://oreilly.com/catalog/9780596514556/ is a good easy way to jump into processing. There are some frustrating typos in the code, but if you're a programmer you should be able to fix them quickly, and you build some neat stuff.