I think this is totally essential for writers! I also have an old handheld cassette recorder, named Danny (long story), that I carry with me just about everywhere. He's really useful for me because that way I can record my ideas as fast as I can say them and I can also do it like when I'm somewhere that I can't write something down (like if it's too dark to see or if I'm driving) I can get my ideas down without looking at a paper. But I also have a notebook I take too for the times when I can't talk out loud. Thanks for sharing this great tip!