The Category Theory book on Wikibooks<http://en.wikibooks.org/wiki/Category_Theory>has been languishing for three years, except for some good work done by Physis <http://en.wikibooks.org/wiki/User:Physis>. I have spent the last two days reorganizing it and cleaning it up. I have broken the book into pages and introduced some stubs. I have rewritten the Introduction and most of the chapter on Categories. The chapter on Natural Transformations covers the topic but I recommend it be rewritten in a more labeled style with bulleted lists, subsections, etc (like the Categories chapter) The other chapters need to be completely rewritten to fix the TeX, get rid of the page references (to someone's lecture notes, presumably), and so on. This is a good project for retired category theorists. Younger mathematicians get no academic rewards at all for contributing to Wikis. Note: If you are interested in something special, just write it up! For example you could write up typed lambda-calculus as an example, or a section on sheaves, or an introduction to 2-categories. If you need to refer to something not yet written, just add a stub. *Wikibooks do not have to be done in order. * -- professional website: http://www.cwru.edu/artsci/math/wells/home.html blog: http://sixwingedseraph.wordpress.com/ abstract math website: http://www.abstractmath.org/MM//MMIntro.htm astounding math stories: http://www.abstractmath.org/MM//MMAstoundingMath.htm personal website: http://www.abstractmath.org/Personal/index.html sixwingedseraph.facebook.com [For admin and other information see: http://www.mta.ca/~cat-dist/ ]