This is a good one to start with:

31. How to Be Great

by Leo Babauta, Zen Habits

I wish I could copy and paste the whole thing right here so you could read it right away. Every time I breeze through this one I want to go out and create something.

This one has a lot of widely applicable nuggets:

49. The 20 Best Lessons From Social Psychology

by Zach Hamed, Medium

Quick, bite-size snippets of psychology lessons that can help you understand the behavior of the people you're writing for.

I enjoyed many of these quotes:

39. The 25 Greatest Quotes About Writing

via This Isn't Happiness

Just a really great collection of inspiration. One of my favorites (from Kafka, kind of an ironic inspiration):

"Don't bend; don't water it down; don't try to make it logical; don't edit your own soul according to the fashion. Rather, follow your most intense obsessions mercilessly."

This interview with Maria Popova of Brainpicker is worth multiple reads.

47. Here's How Maria Popova of Brain Pickings Writes

by Kelton Reid, Copyblogger

I could have picked any number of "Here's How X Writes" posts from the Copyblogger series, so narrowing it down was hard. Read several, or them all. Maria Popova's interview was especially fascinating because she creates so much writing content all by herself, and she's so well-versed in the writing of others.