Preview successful applications from grantseekers whose projects are similar to yours. You'll not only get some good ideas, you'll also improve your understanding of the competition. Try to get program officials to review a 3-5 page summary of your plan first, to make sure you're on the right track. Don't overlook marketing. Make sure your organization will appeal to a potential funder, try to look professional, and involve key figures in your community if possible.
Good management is vital.
Be prepared to demonstrate that you have the management skills and experience that can deliver success. Know the funder. Don't ask for hidden agendas, but find out about general trends or new ideas that currently interest the funder. Always work to a timetable. Make sure you have the time to complete your application and meet the funder's deadline.