may sound corny...but buy a large dry eraser board and some magic markers.
Put the board somewhere visible where you can see ALL the time, so that it's basically staring you in the face. Write some inspirational quotes or whatever it takes to get you motivated to be organized and responsible..
then...divide up the board however you like. For instance, i have it separated in 5 different parts
House (Anything involving bills, cleaning, laundry, things i need for the house etc)
School (assignments due, papers, tests )
Me ( Anything related to bodybuilding or self maintanence)
Etc - self explanatory
Job - self explantory...
Write everything you have to do in the right category, and next to it if applicable, put the deadline you want the task to be done by.
Update it daily and try to redo it every few days once you've cleared enough tasks. Also make sure you right down any responsibility you have ASAP, otherwise you might forget and it'll get lost in the shuffle.
It may sound a little strange at first but it is very very effective.
It also helps if you carry around a little notepad if you're out of the house alot, so you remember what to put on that board when you get home.
I implemented this a few months ago and my life has been completely different. IMHO this works much much better than a palm pilot for the simple fact that you can always see it right in front of your face without having to look for it.