I wouldn't dream of getting an IPhone -- I'm just not an Apple fan, the stuff the fanbois view as some Jobsian vision of simplicity I view as troubling restrictions. I don't want a phone that *could* multitask but doesn't due to artificial restrictions, I don't want to jailbreak my phone just to be able to put my own apps on (as opposed to being forced to go through an app store), and I don't want a phone where the app store itself is so restrictive. Also, Flash -- IDK if the Nexus One has Flash yet, but I'm sure it will have it, whereas Adobe has had Flash for IPhone for like a year but Jobs specifically will not allow a Flash plugin, or alternate browsers (that could support Flash), onto it. So, no question, Nexus One.
(OK, this is theoretical for me -- I have Verizon -- but I do plan to get a Droid, and have 0 interest in IPhone even if a CDMA model does come out.)