The following are links to university and government sites that provide helpful tips for writing a grant proposal.

Developing a Grant Proposal - This link to the General Services Administration (GSA) details the process of writing proposals for both government and private foundations grants.
How to Write a Grant. - This link will take you the the NIH/NIAID website where you will find various links to access portals appropriate to your needs.

Grant Writing Tip Sheets and Tutorials

Many NIH Institutes put out guides and tip sheets on their Web sites. These guides can be useful resources. Here are just a few.

All About Grants - Including Grant Application Basics, How to Plan a Grant Application and How to Write a Grant Application.
Preparing Grant Applications - General instructions for preparing grants in NIH format
A Grant Application Checklist - Presented by NIH/NINDS
Quick Guide for Grant Applications -Provides key tips and issues to consider before, during, and after writing your application
Writing a Grant – An article outlining how to write a successful NIH grant.
Tips for New NIH Grant Applicants – An article for those new to the NIH grant process.