Not a lurker, I guess, but we have Verizon, and dh got a Treo back in August. I have to admit, I don't really like using it as a phone, strangely enough - I'm not quite sure what it is, but it just isn't ideal. It does work as a limited internet access - ok for some stuff, but not everything, since it shrinks everything down, and is relatively slow. But, it probably would be able to handle your itinerary, too. It fits in dh's pockets, but probably wouldn't fit in most of mine, lol. (He's trying to get me to upgrade when my contract expires in February). Another issue I have with it is that since he has it synced with our office Outlook address book, he doesn't seem to *also* have a normal phonebook, so you have to look through the 3000+ names in Outlook. I realize that isn't an issue for most people, of course!
Btw, my favorite Treo program is Google maps - it will tell you where you are (GPS enabled!), and you can even have it show traffic levels in major metropolitan areas! (Major highways only, tho) It also has a couple of games - dd found the Bubble Breaker game quite addictive. (Ok, so do I) We may break that one out during long waits, if necessary...