I recently deactivated my PalmOS-based Samsung i500 because it was no longer staying on reliably even when the battery was fully charged. I reactivated a Sanyo SCP-8100 and started reusing a Sony Clie PEG-TJ27 to replace it.
My wife has an iPod Touch. It's really neat as a toy, but I haven't tried to use it for "real" yet. (It unfortunately also has a "hiss" noise when listening to music - it's like tape hiss from a cassette. I hope they can get rid of that with an update.) I thought it would be a great thing to have on a trip out of town, but when she's taken it with her, quite often she wasn't able to get WiFi access, so it wasn't of much use for maps, local information, and the like. I suspect that is becoming less of an issue over time.
I'm trying to hold off on getting anything like an iPhone. I hate the idea of being tied to a service for 2 years (I've been with Sprint PCS long enough that I've never had a contract with them - they started as a monthly service.) I'm hopeful that the Android phones will take off, but I have a nagging fear that Apple has such a big lead (especially in the buzz department) that they may be still-born before they can build a real market presence. Windows Mobile phones have always been a turn-off for me (rather like your Apple avoidance, I suspect).
I agree with you that a responsive UI is very important in a phone, especially if one is entering text, but I want a smart phone that is able to run things in the background as well. I also want a phone that has reasonable battery life. I don't care about it having a camera or a music player or being able to play Donkey Kong. Give me a phone that can run DateBk6 (or something very similar), has viewers for PDF files and spreadsheets, and can read and compose simple e-mail, has some sort of flash memory expansion slot, with excellent battery life and I'll be happy. If I want a music player, I'll get a Nano or something similar. If I want a camera, I'll probably want one that has adjustable focus and zoom and don't want that on my phone.
My $0.02.
Cheers,
Scott.