Based on a technique I’ve used for clients in the past, I turned a simple ruby script I had into a small (free) web app:
Essentially, when you’re stuck for something to write about, or just want to know what sorts of questions about Topic X are asked, plug in the topic and get back the Google Search Suggestions for questions (who, what, when, where, why, how to, how do) about that topic.
Also available in handy-dandy csv download for later uploading into the Keyword Planner if you want theoretical search volume.
Hope somebody other than me finds it useful. I’m already using it to brainstorm newsletter and blog post ideas.