Query Letters:
http://kidlit.com/2009/08/05/writing-a-simple-compelling-query/
http://kidlit.com/2011/05/02/the-one-right-way-to-write-a-query/
Plotting/Revising:
This books has tons of helps for plotting, revising, formatting scenes, etc. I refer to it frequently!
http://www.blakesnyder.com/2010/09/17/the-last-novel-writing-book-you%E2%80%99ll-ever-need/
Save the Cat Beat Sheet: This link is for movies, but it's awesome for novels too. It saved my bacon with my WIPs.
Characters/Emotion:
The key to great writing and hooking your readers is appealing to their emotions, getting them to feel what your character feels even if the reader themselves would react differently. This book is invaluable in helping with that.
