One thing I found, is that organizing is only useful if your system works for you. What works for me won't work for everyone, but I find the peace of mind and extra time you gain from taking the time to clean up is totally worth it. I spend less, relax more, enjoy the things I have because I can see them, and enjoy the people I love because I'm not too busy to just hang out!
One thing I found is that any system that requires me to move stuff won't work. I like shelves and boxes so I don't have to move some stuff to find others.