Arn, you may want to get your Newton back out...
I've been using Palm III for years. I mainly use the To-Do list feature, but also memos and addresses. I've got to have a good to-do list feature, that's the main thing.
I tried a Newton 130 years ago, and the recognition just plain stank. With no recognition and no way to input data on the computer either, it was unusable as an organizer. It was only good for playing Mah Jongg.
Recently, tho, I got a Newton 2000 (upgraded to a 2100). And I got Graffiti, and I got an ethernet card. Now I experience what Arn writes about. With Graffiti, data entry is error-free; and with ethernet, backing up to PC is painless; and with everchanging's newtsync, it syncs with Address Book and iCal.
Negative: It's big. Positive: It's big.
Yes, the big screen size puts it much beyond the Palm III in user pleasure. (Doesn't the M100 have an extra-small screen?) And as Arn says, you don't have to worry about data loss. I have a flash card to do backups.
I use four rechargable AA NiMHs in my Newton. They last about two weeks before needing to be recharged. When the day comes that they won't keep a charge, I'll pop into Radio Shack and buy more. In the Palm-III, I use rechargable AAA NiMHs. They last about a month before needing to be recharged. The latest Palms don't have user-replacable batteries...