The Nonprofit Guides website is a grantwriting guidebook with sample grant forms including a complete sample grant application, sample grant budget, sample cover sheet and cover letter, and links to grantmakers.
The Foundation Center provides user friendly funding and foundation directories in their 'Find Funders' section.
Excellent tutorial from the Congressional Reference Division describes major components of the written grant proposal and gives basic guidelines for developing, organizing, and writing the proposal.
Collection of resources on the practice of grantmaking.
The Foundation Center provides a good overview on proposal writing.
Offers grantwriting training and tips, low cost publications and online abstracts from funded proposals. There is a large list of grant sources on this site.
Bibliography of publications on fund raising and grant writing.
GrantProposal.com presents guidelines, tips, and samples on effective grantwriting and related written communications with funders.