Forgetfulness: how do you deal with it?

unfortunately i can't set the alarm to remind me to turn off my car lights and remember to take the keys off the front door and where i put my glasses, calculator, or any other thing that doesnt ring or beep.

I have Microsoft outlook on my computer. Everything I have to do, I make an appointment for on my calendar. I love that it pops up with a little box to remind me 15 minutes before. Seriously, if it's not on my calendar, I won't remember it. Gosh, if I had a PDA, and it had that feature, I might even get to my appointments early! :-)