I use a Moleskine notebook to keep track of things during the day.
I try to keep it on me at all times. It’s useful for taking notes at a conference when I can’t use my computer (or the battery is dead), when I’m sourcing stories for AfriGadget, when I’ve got a “brilliant idea” while out and about, or when I need to take notes from a phone call.
It’s not like you couldn’t use any old notebook to do the same thing – I just happened to buy into the Moleskine story. Sometimes the answer isn’t gadgets or the web, it’s what our grandparent’s grew up using.
Technology’s great benefit is simplifying complex tasks. We need to guard against complicating simplex tasks.