Looky, looky. Amazon.com has its own self-publishing company, CreateSpace, where trade paperbacks are created from pdf files. They supply an ISBN, or you provide one.
Not the same as an e-book, but something to think about as I ponder my project (see My E-Book Road: Introduction).
I'm wondering how CreateSpace product is treated on Amazon.Com ... and is this a very simple, fast way to get your product onto Amazon?
Costs, quality questions and much more at the CreateSpace site.