I'd like to try an "open source" publishing experiment with this book, expanding it to include many more specialized topics, examples (hopefully, interactive), and teaching aids contributed by users. The model would be the one developed by open-source computing communities: a review board that accepts submissions from developers, verifies their utility and accuracy, and then makes them available to the user community.
If anyone is interested in this experiment, please contact me off-list.
check out www.commontext.org; that's the most thoroughly organized group that's pushing for textbook publication to adopt open-source or open-content licensing. i've 'pushed' the text of your message in the general direction of their staff; they're good (friendly, smart) guys. elijah