I didn't think much about PDAs either (although I could other people were using them) until I finally got myself a Palm. Very quickly I couldn't live without it, it's like getting an extra little brain to keep track of all things I didn't know needed tracking.

I still carry my Palm PDA in addition to the N800, because as Scrabbler said the Palm is just so much better at those things. (GVM can make up for some, but not all, and nothing that really needs alarms.)

Smartphones are not for me, even if they had good PIM (which they IMO mostly don't have) - their screens are too small for me (and getting more of a problem for every year..), unless the phone is as big as a PDA and that's a bad phone as far as I'm concerned. So, for some of us, PDAs are not dead at all and won't be for the foreseeable future.