I agree with the review that is linked. In essence, I used the Droid for 20 minutes and instantly knew it brought INCREDIBLE flexibility increase over the iPhone. I think a lot of the reviews out there fail to go into the real advantages this android device has nailed. Main points of improvement/evolution being the browser, notification panel (multi task for messaging/IM) and cool widget/shortcut setup for your home screens, and the obvious ones like launching with google maps with navigation and the cool google sync style backup. The droid gives the user a lot more control of what's immediately accessible to them at any given time. I found it a great deal better experience compared to using the iPhone ever since day 1 of the first gen launch because it conquers all the hangups of the iPhone interface that annoy you between the IM solutions available and the clunky email.
Now, if email was all I cared about, I'd have a blackberry. For some, the iPhone will still be the end all be all as well- those users who find their coverage works well in the places they want to use it, and aren't heavy email/IMers, and really just want to use the device as an entertainment station with all the fun apps and do some occasional email access or IM over 3g, and don't mind having an obnoxious notification box in their face every single time someone texts/IMs them. The droid is a much more functional, flexible platform that's built for the utmost usability and unified by the incredible vision of Google in all its designs, that equals the iPhone's basic interface design and surpasses it in many critical ways.
Applications will make their way to the platform with time. For me, I really feel that Google has come along and rendered the iPhone more of a "sidekick" fun device that's really targeting people who love the hell out of their iPods and aren't smartphone users already. I mean that's where they got their start, but with the huge catch-on of the app environment they went much much further, but failed to evolve away from some of the core problems in their OS. Now Google is providing that evolution, and I think Apple has some catching up to do. I think much more of the iPhone user base than you all might imagine will be prone to these same impressions with the Droid and will switch at the earliest opportunity. For me, I am buying droid as soon as possible budget-wise, and I can triumphantly fit my apps that I'll keep the deactivated iPhone around for into one home-screen page (games and music production tools).