The Everything Grant Writing Book

This is a pretty good guide on how to write a grant proposal. Of course, much of the process depends on the specific grant one is pursuing, but this guide offers general tips on what to expect and what various foundations will be looking for in a proposal.
We get a lot of people here at the library who ask for the Matthew Lesko series of books (he's that frenetic guy on TV who wears a question mark-laden suit). Those books are fine, but they also promote the perception that money is out there just waiting for someone to ask for it. In a sense, that's true, but this guide is more honest about the amount of work that goes into pursuing those funds and the skills needed for success.