I go into a fit if I don't have my little planner. How do people survive without one? Helpful in innumerable ways.
Want to know where that great Burmese place was – no problem, just look in the restaurants section of the notes. Need to call your landlord but your cell phone is dead? No problem because you wrote it in your planner. Always forgetting when you are due for a check up? No longer, because you made a note on the day you're due… see?
You don't need fancy Blackberry technology to stay on top of your life. I recommend a Moleskine planner (they have high quality paper and leather) which can also serve another function – a keepsake of your life one day at a time.
I keep all of mine and get a kick looking through the years gone by all in pen and ink with added notations.