I'm interested in learning how to create the type of visualizations you see at http://flowingdata.com and informationisbeautiful. EDIT: Meaning, visualizations that are interesting in of themselves -- kinda like the NY Times graphics, as opposed to a quick something for a report.
What kinds of tools are used to create these -- is it mostly a lot of Adobe Illustrator/Photoshop? What are good resources (books, websites, etc.) to learn how to use these tools for data visualization in particular?
I know what I want visualizations to look like (and I'm familiar with design principles, e.g., from Tufte's books), but I have no idea how to create them.