Using email as to-do list

Have you ever thought of using your email program as a to-do list? I am constantly thinking of important things needing to be done when I am away from my work desk, but I am getting to that stage in life where if I don't write something down it is as quickly forgotten again. I always carry a small pocket diary and jot essential things into that, but if I am at home, I send myself an email with a reminder, and then it's waiting for me when I get to work. It saves losing scraps of paper, or remembering to look at them. Even at work, I will email myself a reminder of some important task. Because I monitor my emails numerous times through the day, the reminder is constantly there in front of me, and it cuts down the clutter on my desk.
Another solution is electronic post-it notes. A freeware example is Simple Sticky Notes. Double-click the program's icon in your system tray, and it creates a note for you. Type in what you want to remember, and you're done. You can drag the note to any spot on your desktop. There are more complex paid programs, which for instance can post notes inside a Word document or in your web browser, but this one is straightforward and simple to use.