I'm also working on a whole bunch of tutorials (for a couple of projects I, alas, can't talk about yet). I find it helpful when I'm working on lots of tutorials at once to make a chart instead of writing lots of to do lists. It works pretty well even if the tutorials are all for very different things as they all involve the same basic steps to get from idea to finished tutorial. Ticking each small task off as I work through them I can see the progress I'm making and can see at a glance what tasks still need doing.
This is my current chart. Lots done, but quite a bit still to do!
I made a gigantic "to do chart" when I was working on my new book and it really helped keep me organised during a very hectic time.
For each design I worked on I needed to sketch it, design the templates, (maybe) sew a prototype, write notes on how to make it, sew it, take step by step photos, edit the photos, resize and label the photos, take final reference photos of the finished piece, type up my notes, draft the tutorial, proofread it, make final changes, draw the templates out neatly, make copies of the templates, pack up the project, and then post the project & templates and email the tutorial & accompanying photos.
Multiply that by all the different projects that make up a book and, well, you can see why the chart was so useful! :)