[njharman]

http://www.lulu.com/ is one of many, many. There are books sold in iTunes App Store today. Many I've seen are just lame repackaging of public domain texts.

[tontoa4]

These places seem like they're more targeted toward producing physical products. I'd focus on digital. Still think it's a viable idea for sure.

[unalone]

Also: Amazon lets you publish books directly from them using createspace.com, and you can sell a Kindle book for no charge (I think).