This is a list of links for faculty to browse to learn more about writing across the curriculum and in their disciplines. Many of the linked sites also include useful handouts on writing for classes.
WAC Clearinghouse at Colorado State University
This site provides valuable resources and scholarship on writing across the curriculum.
York WAC Guide to Writing in the Disciplines 
This link provides a list of guides to writing in disciplines ranging from Anthropology to Theater.   
Writing Across the Curriculum and Writing in the Disciplines at OWL Online Writing Lab at Purdue University
This site provides information and handouts for writing across the curriculum.
The Center for Writing Studies at the University of Illinois at Urbana-Champaign
This website provides useful handouts for faculty and students in writing across the curriculum.
WAC Resources Bibliography from Hunter College, CUNY
This site provides a comprehensive bibliography of writing across the curriculum resources.