I haven't found any "authoritatuve" resources on the web, but I can recommend "The Straw Bale House" by Bill Steen and David Bainbridge. It is a comprehensive reference with history, design considerations, case studies, etc. Another book that I have perused at the bookstore but unsure of the exact title and author is "Build it with Bales".

Have you found Out on Bale on the Web? http://www2.strawhomes.com/tls/

Good luck - if you find any other useful references, email them to me.