According to editor Chris Thron:
"The treatment is far more elementary than any other book on abstract algebra that we've seen. The text is designed for students who are planning to become secondary-school teachers. We particularly emphasize material that has relevance to high-school math, as well as practical applications."The link above will lead to both on-line (html) and pdf versions of the text. Print-on-demand copies are available through Lulu. There is also a series of supporting YouTube videos.
If you have used the text in its current form, please consider writing a review for the MAA Reviews website. The previous blog posting describes best practices for doing so.
As a follow up to this blog posting, I hope to get some insight into how this large number of collaborators managed to work together.