PDAGround has gathered the thoughts (http://pdaground.com/modules.php?name=Content&pa=showpage&pid=78) of many developers about what they think of "PhonePDAs." Their feelings are kind of like ours:
I love them. I hate them. I love them. I hate them. On and on it goes!

(via PDArcade (http://www.pdarcade.com/index.php))