Consider college text books.
According to the Los Angeles Times college text books average $120 each (late 2006) and the major book publishers are still jacking up the prices. According to the LA Times, many poor students are barred from higher education (even though they have financial aid or a scholarship) because they simply cant afford the price of text books, which can be more than a thousand dollars a semester/quarter.
The major book publishers put out new (more expensive) editions of text books every three years. It just happens to be that three years is the amount of time for a text book to saturate the used text book market and cut into sales of new books. The book publishers claim that this is mere coincidence with the timing of their new editions and that they only publish new editions when they need to make improvements on the existing text. it is mere coincidence that these necessary improvements happen to exactly match the sales cycle for every text book they publish!
My plan is to write free downloadable college text books in fields where I am already an expert (including English composition 101, computer programming, history, music thoery, and nutrition). These text books will be available for free reading on the website, free download as PDFs, and can be printed for free by colleges and universities for free distribution to their students. Note that every college student at any English-speaking college or university is required to take English Composition 101.
The best way to contact me is Milo, PO Box 1361, Tustin, California, 92781, USA. I check my mail at least once a month.