A colleague at work showed me Mural.ly a few weeks ago and I registered but had nothing concrete to work on. When I knew we would have to do a design notebook I decided to use it.
I have been using Scratch for some years now, I really enjoy programming crazy things that come to my mind, sometimes with my son and daughter, so I wanted to show more than just the proposed About Me or 10 Blocks.
Keeping a design notebook is a good idea and the format or tool to build it should be the last thing encouraged. We know that some people prefer the visual or the textual or sound or even the movement to learn. The important thing I think is to have a place where we can go back to remember the lessons learned.
I have seen that some people used a blog, which is a good idea, but a collection of pictures tweeted could also work and, why not, just the collection of projects with instructions and notes in a Scratch studio could do the trick.