I am notoriously forgetful. As my mother always said, I would forget my head if it weren't attached to my body. I've tried a couple of times to use a paper organizer, but I never could seem to use the thing. Then I got my first PDA phone, a Kyocera 6035 Smartphone. It was at least 2 generations back on the Palm scale, but it was good enough a PDA for me, and it was the best cell phone I've ever owned. Since my employer paid my phone bills, I didn't need a pager too, so I only had one device. I started calling it my extended memory because I could put stuff in there, and it was backed up in multiple places.
I went through 2 Kyocera 6035s, and when the second one died under warrantee, Sprint gave me a Samsung i300. It was the same generation as the Kyocera, and color too, but the Palm part is about the same. I wasn't ever very happy with the phone, and when I switched to the Current Employer and got out from under my contract, I dropped Sprint, and just used it as a PDA.
Then I started paying less attention to the PDA than I should have. When we got the new laptop at home, we took down the older workstation. I didn't back my PDA up to the laptop like I should. At work, I only backed it up to the older PC, not my desktop Mac, so I didn't integrate it into a calendar or Address Book like I should have. When the battery died and the hard drive went out on the old PC I was using, I couldn't bring back my memory. I ended up missing a meeting, as well as losing almost a month's worth of checking account data. (The latter was easy to recover: put $0 in the balance and start over ;) .)
Now, the PDA is charged again, and tied into the applications on the Mac. I can say I've recovered most of my memory.... :)