What do you do to remind yourself of things you need to do?

I know everyone has their own way of reminding themselves of things that need to be done - some put strings around their finger, while, other put post-it notes up where they can see them. Below are a few things I do to make me remember ...

- I have a to do list that I always have on my desk
- I have a planner that I religiously check
- I leave myself messages on my cell phone - I also set the alarm/calendar on my cell phone
- I use an online calendar as well as an organizer I have in my computer
- I carry around a small notebook in my purse where I jot down important stuff

My teen kids - write notes on their hands with an ink pen - Now, That annoys me sooooooo much! I have argued with them too many times that I am just tired. I just try my best to keep my cool when I see little scribbles on their hands and remind them to wash it off as soon as they can.

How about you - What do you do? Perhaps you have an easier and more logical way I can try to remind me of things that I need to do.