put simply lulu is a website that enables you to create a book.
You upload your final text, create a pdf, decide on a layout and a cover and you're there.
The pdf exists on the website (and on amazon and other sites) where people can order a copy if they want.
The interesting thing is that a copy is only ever printed when somebody wants one (it's called print on demand). It is also exteremely accessible and useful to people like me who got fed up with accumulating rejection letters from agents and publishers.
The important thing for me is that it is out there, has sold a few copies and I can move on to the next thing.
The downside is that I have to market the book myself which is much harder than writing!
I've found one useful way of getting people to read my book is to offer discounted copies to reading groups and book clubs (real ones not virtual ones) and offering to go along and talk about the book and publishing.
If anybody knows of any that might be interested please let me know!
David