One of the best ways to learn about the grant process, become familiar with a particular grant program, broaden your professional network, and improve your own grant writing skills is to serve on a review panel.
Possible Benefits from reviewing and serving on panels:
Most federal funding agencies and many national organizations and private funding agencies rely on faculty/scholars to review and advise on which proposals should be funded. These agencies are often seeking someone like you to enrich their rosters of potential review panelists.
If you are interested in this kind of service, here are some resources:
National Science Foundation
National Institutes of Health
U.S. Department of Agriculture
U.S. Department of Education, Office of Postsecondary Education
The National Endowment for the Humanities
DHHS, Human Resources and Services Administration
DHHS, Substance Abuse & Mental Health Services Administration (SAMHSA)
Institute for Museum and Library Services
Check your own professional organizations for possible opportunities.