Shared Book Technology allows community annotations

SharedBook.com is opening up books to annotation:

This is wikipedia-type capability with a spin that publishers and authors will really like. With wikipedia, the edits and annotations from “the crowd” (or from whomever is allowed to mess with the wiki) actually change and revise the content itself. With SharedBook’s annotation technology, the original published content remains locked, and the changes are appended as footnotes! The footnotes can be associated to a chunk, a paragraph, a word, a symbol, a diagram, a picture. Whatever you like. And using the capability to manipulate content into a one-off book that SharedBook is known for, a reader can order up a printed book with whichever of the footnotes the reader wants in their own copy of the book. They’re then numbered consecutively and gathered at the back of the book.