I used to be crazy about the Windows PocketPCs (hey, it was back in my Windows days), and later about the Palms. Heck, I had a Radio Shack Hoop Commander in late middle school. It was basically a cheap version of the old BOSS organizers with this crappy basketball game included.
Then, as I got further into college, I realized that I used my organizers less despite needing them more. I figured out why: it took me way too long to sit down and open the organizer, find the calendar, add an appointment in Graffiti, correct the mistakes, mutter things about the organizer's mother under my breath, and close it. Paper's way quicker, and I already have an iBook, iPod, and phone to lug around. This is why we still use paper.
This fall (my first year of grad school

) I finally found the joy of
PocketMod, combined with a very small pen. I keep them in my pocket pretty much wherever I go, and it works fine. If you're having organization troubles, check out
43folders, which talks about different ways to organize your life. Not everyone can live by the "Seven Habits" and all that jazz.