rubi is on the right track. i would put the treo as a PDA first. the Q seems to operate “more so” as a phone than a PDA, but in generalities, PDA phones are a lot alike.
and :word: to howie’s comment on the sidekick, coverage aside.
edit: and if you are going to USE the features, then by all means, get a PDA phone. i see too many people that want it just for the look of it and to “look important”. those are the people that also arnt aware of the data feature.