Anthologize is a tool for content creators to turn their website, and other materials they have syndicated I believe, into a book. It was produced by the Center for History and New Media’s “One Week, One Tool” project. They used a number of extant ideas and projects as their starting points:

• Matt Cutt’s Blog to Book
• Hugh McGuire’s “An Open, Webby, Book-Publishing Platform”
• O’Reilly’s Tools of Change

UPDATE: Further along in the traditional publishing workflow comes editing and I just came across a website that allows for a kind of crowdsourcing of editing: it’s called BiteSizeEdits. Fascinating.

UPDATE 2: There’s a commercial site doing this: http://leanpub.com/.