There is no perfect personal organization system. No filing system, no PDA, no anti-PDA, no labelmaker and no potion is going to do every single thing you need it to. Every solution has its strengths and weaknesses. Your absolute must-have requirements mixed in with the shortcomings you're willing to tolerate will determine what's right for you.
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I carry around a 70 sheet spiral notebook with a cardboard cover which cost about a buck at the local drugstore. In it I write down my daily to-do's and project lists.... It's lofi, plain, simple and not very exciting. It simply works.