I use index cards every day to keep my to do lists. I carry them with me to meetings and write what I need to do on one what I need to purchase on another and what I need to follow up with others on yet another. That way as I check off my lists I can just file them with a date or toss the ones that I don't need.
I had used purple index cards that would not go through the printer all the way. We had to take the tonor cartridge out to retrieve them. I had no such problems with these white Staple brand index cards.