I've tried a few things in the last couple of years to take my note taking electronic, and it turns out that delay is important - if there's too much delay I end up not jotting down the couple of quick notes I need to write. Wunderlist opens very quickly on my Android phone and I ended up unconsciously using it to write down quick things. OneNote (an otherwise great tool) take an age to open and get to the right page, so I end up not using it except at my desk.