I have started typing lecture/course notes into Voodoopad and for some of the things I do I need quick sketch diagrams in there and I am looking of ways to do it. Ideas so far: 1) Draw by hand and: 1.1) Take a photograph (possibly a sheet at a time and cut them up) 1.2) Scan them as above 2) Graphics tablet. If so what software would work well for this? I have photoshop/illustrator, but I think this would be overkill for a simple line drawing. Open to any recommendations. Any others?