I am obsessed with organisation and technology so the blackberry torch is my little piece of heaven. It syncs your tasks with your calendar and its just... incredible! you've also got other handy apps such as memos and voice recording.
I use the Calendar Pad app on my phone with 2 widgets for quick reference: 1 showing the entire month, and 1 with the week laid out. It's been extremely convenient for me as, unlike the monthly planner I used to have, my phone's always with me anyway...along with the morse code trainer I have in it.