Here's a 6-minute video walkthrough I made for our support team showing them a tweak to the new sidebar in Basecamp 5. It's a fundamental change to a sensitive feature, so I wanted to make sure they had both a heads up, and a principled walkthrough of the reasons behind the change. We're not done with it, but we're far enough along that all the big stuff is represented. I thought people who make product might find this behind-the-scenes stuff interesting, while others will probably be bored…