Do you need to remember something very important? Do you lose the yellow stickies that you use to remind yourself of important events? Do you need to leave a note for your roommate?
My way of keeping track of important tasks is very easy. I just write it on my bathroom mirror. If you use "Dry Erase" markers you can write on any unscratched glass surface and the writing will wipe off with a tissue.
I keep a cup of multi-colored Dry Erase markers by the bathroom mirror and write important notes to myself. It's also fun after parties or after a friend has been visiting - I'll often find a note to me from my friends.