I'm talking about your primary organizer here, not a duplicate calender you might keep in the kitchen. What do you reach for if you need to make an appointment - a diary or an electronic organizer?

Ornella started a thread about handbag size and weight recently; I would love to 'downsize' my bag, but one of bulkiest things I carry is a B5 sized Filofax. Somehow I relate better to a week-in-view, pencil and paper system, even though I carry a smartphone. I'm not sure if it's because I'm a highly visual thinker or I'm just old!

What do you use to co-ordinate appointments, family, work? Have you transitioned from one to the other? Any pointers for me?