Preparing Your NSF Proposal
NSF is the only federal agency whose mission includes support for all fields of fundamental science and engineering, except for medical sciences. NSF is tasked with keeping the United States at the leading edge of discovery in a wide range of scientific areas, from astronomy to geology to zoology. Unlike many other federal agencies, NSF does not hire researchers or directly operate their own laboratories or similar facilities. Instead, they support scientists, engineers and educators directly through their own home institutions (typically universities and colleges). Similarly, they fund facilities and equipment such as telescopes, through cooperative agreements with research consortia that have competed successfully for limited-term management contracts.
Here are some links and tips to help you in preparing your proposal:
NSF's A Guide for Proposal Writing (NOT to be confused with the Grant Proposal Guide, which you can access by clicking on the link above)