Obviously popular:
note notes use notes sticky notes lots o' notes lots of sticky notes notes notes notes need notes,
That's one avenue you could take, ill give you another friend.

Associative learning: 
Rituals, not talking the spiritual ones either here im talking about developing a habit witch you can over time associate to that of what you are doing hense your mind operates through the dynamists of association to diversify and polarize your correlation with different aspects making it easier to be organized.

Achieving order through disorder:
That's another avenue you could take next lets try the unconventional approach, say for example you've tried the obvious so here is a nonconventional one for ya, purposely make things out of place, off clutter, at strange angles and out of order, not dirty but just disorganized, now here is why you now have given everything a unique identity everything is slightly different now so your mind might actually do a better job at organizing what it looked like what was surrounding it and where is was. Now what if your talking about organizing interactions with people and not objects in your place, well same rule applies my friend. Try the normal angle just slightly off kilter slightly different subtle nuances if everything is slightly different it makes it easier to remember. However this doesn't work for everybody so ill give you one more.

Achieving order through Higher magnitude of Order:
Keep things organized by class keep more track of the time analyze your schedule and time frames heavily keep deadlines and records in your head you will become whatever your mind is always focused on you want to be organized and the other tidbits of advice aren't doin it for ya this might be the one just commit live in order track your order keep everything pristine keep more track of the time as the day goes by log time with what you do log events with where you go draw lines and make the correlations if this doesn't work I might be able to cook up a few more examples but I hope this helped.

If none of these strike your fancy let me know and I will help you further, or tell me witch one you may be interested in exploring further, think of me as your organizational advocate.
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