Brilliant. You can also add an Object Type Query that looks for content that hasn't been tagged at all. That proves very useful in a setup like this. Unless I missed it, what I originally hoped to create was a query that returned content where I had only ONE tag; not a specific tag, but rather, content that just had been tagged once.
By all means, I can't reproduce creating the queries inline. All I end up is having a link to the query. Then I manually must change this to a link-block and then embed it. What is going on? Is there the one secret setting I didn't manage to find? How do I create such inline blocks?
You can click and drag blocks around to make columns - you want to drag until you see a blue line pop up and this will tell you where the block will go!