I'm ashamed to tell you this, but I can't live without Post-its! I'm not kidding! You know how people use date books, or electronic organizers? I use Post-its! They are my organizers. When I buy Post-its, I buy them in a great big package so I know they'll be there when I need to make a quick note.
My office/computer room has the biggest stash of Post-its. Naturally, that's where I do most of my work; paying bills, making appointments, etc. My desk and calendar are plastered with 3" X 3" colored squares. I buy the super-sticky Post-its so there will be less chance of falling off. Since I use so many of them, I like to spice it up a bit, and buy the brightly colored ones.
I also keep Post-its in both of my cars. This way, if I stop by someone's place, and they're not home, I can leave a note to say I was there. Sometimes I write my mileage on them when I fill the car with gas. Not to mention the numerous times I needed to jot something down while on my cell phone. (Of course, I'm parked at the time.) There are Post-its in my kitchen, and my locker at work too.
I haven't stopped at just buying "regular" sized Post-its either. I now purchase Post-it durable tabs. Those are great for marking places in files or binders.
Ok... I'm having a little panic attack right now, because I just realized I'm low on my Post-it stash. I'm going to put that on my shopping list right now!