From a user of the NSDL Science Literacy Maps: "Just wanted to thank you for the great NSDL maps. I use them in my Intro Sociology course as they neatly summarize key points and provide opportunities for discussion. Easy to use and easy to use in the classroom."
"To make digital content more cost-effective to school districts, publishers and educators agree that the price of the devices will have to come down as more enter the market."
"...textbooks, technology, supplemental materials, and assessments, totals about $18.3 billion... the market at this point for digital content is about $2 billion."