NSF A Guide for Proposal Writing - This guide was written in 2004 and most of the advice still holds true today for writing a good proposal. Short and concise it is worth reading.
"How to get NSF funding: a view from the 'inside'" - This insider's Power Point presentation was created by Gisele Muller-Parker, a former WWU faculty member in Biology, Assistant Director of Shannon Point Marine Center and NSF Program Director. Concise and full of great tips for those new to seeking external funding from NSF.
Proposal and Award Policies and Procedures Guide (PAPPG) 2023 - The PAPPG provides guidance on the National Science Foundation's proposal and award process. Consisting of two parts, part one is used in conjunction with program specific guidelines for proposal preparation and part two covers award administration.