You can publish e-books, reports and white papers on Kindle and other e-book readers. You may re-purpose content that you already have and publish on Kindle. 10 pages will do.
On Kindle you can sell your e-book starting at 0.99 cents.
Create a call to action leading people to a capture page to get their information and market to them using an auto-responder series and you just found another lead generation channel.
We are talking about millions of people with their e-book readers downloading things to read.