Here's the idea of the craft agenda book. If a project is put aside, or if a number of projects are being done at the same time, give each project a name and date, and write down what the next step has to be when starting on the project again. In this way, you will know exactly where to begin, and what you need to do, and the notes will be easily available so you can start the work again quickly. This can be done for every craft project, scrapbook, or gift item that you have in line for completion.
While I am not against notes in a computer format, I highly suggest a physical notebook kept with your supplies of craft materials so that you can easily refer to it when you get the urge to sit down to craft.