Here is a good article by Linda Chalker- Scott, Ph.D., Extension Horticulturist and Associate Professor, Puyallup Research and Extension Center, Washington State University
http://puyallup.wsu.edu/~Linda%20Cha...ips%202007.pdf
about bark mulch and sawdust
http://puyallup.wsu.edu/~linda%20cha...rk%20mulch.pdf
She is a bit shy about wood chips in veggie gardens, but as someone else mentioned in another thread, the 'Back to Eden' method clearly shows that it works. (However, the Back to Eden methods also assumes the use of chicken manure as a soil amendment).