The Office of Sponsored Programs not only offers advice for crafting a proposal, but has also created a list of other great resources.

Michigan State Proposal Writing Resources

American Council of Learned Societies

The Foundation Center

National Endowment for the Humanities (NEH)

National Institutes of Health (NIH)

National Science Foundation (NSF)

Science's Next Wave

Social Science Research Council

University of Richmond, Foundation, Corporate & Government Relations