If you plan to self-publish your books, all I can say is, "Be Careful."
David Gaurhran, author of the popular self-publishing guide, Let's Get Digital: How to self-publish and why you should, blogs about self publishing. He's all for it. However, this post on his blog warns about the expansion of places that will take your money and give you little to no help -- or worse than that -- bad help. (the statement that some of the self-publishing copy editors leave your manuscript with more errors than they correct is really appalling) Click on over to check this out.
Be sure to read the comments.
There's a lot of good information there as well.