There's a great deal being said about this area. My own books on Lulu - http://www.lulu.com/spotlight/robertworstell(shameful self-promotion, yes I know) gives me some years of experience in this area. And for so long, it's been a bit difficult for a new author to break into publishing.
This has all started changing with the rise of the tablet and smartphone, so people can carry a library of books in their pocket, handbag, or briefcase/satchel/backpack.
I hope to deliver a series of these posts, as it seems to be something which is in high demand, but little real analysis and thoughtful review is being done in this area.
Here's the first installment:
But the above author is really not a success story - even though he tells how to get started. Here are 3 success stories to whet your appetite:
A Self-Publishing Success Story (No Magic Required) Vook