NCA's RFP Tracker
A periodically updated, downloadable PDF of comm-related funding deadlines.

InfoEd
Click on the icon at the upper right (Access Info Office).
Click on the "Spin" icon.

Grants.gov
Try a keyword search with “doctoral” or “dissertation”.

The Foundation Directory, via the library website.
Click on "Articles Via Databases" and select Foundation Directory from the "Database by Title" option.

This great Grants and Fellowships Blog at the University of Chicago can be sorted by field, date, and type of award.

Many of the larger and more generously funded archives, private libraries and historical societies offer fellowships and small grants for researchers who wish to use their collections. For a clearinghouse of archival finding aids, access ArchivesUSA through the NYU Library Website.