I really love my Desire, and enjoy being part of this forum community; but I rally can't understand the lack of tolerance for people who make a positive comment about, or even dare to mention the i-Phone! My humble oppinion is that neither the Desire, nor the i-Phone are all things to all men. The reasons we prefer the Desire, or the Android platform in general, are exactly the same reasons why others might prefer the i-Phone.
The main reason why I prefer the Desire is that it offers an open platform, and that I can customize it to look and to function the way I like. I must admit that, at least in the first couple of months, the most time I spent with the Desire, I spent doing things "for" the phone, rather than "with" the phone; fooling around with Launcher Pro Plus, Widget Locker, Apps Organizer, and Desktop Visualizer; installing and uninstalling countless widgets; creating custom wallpapers, icons, docks in Photoshop etc... And I enjoyed every minute (until I started to encounter memory problems, that is)...
About at the same time I got my Desire, replacing my HTC P4350, I started looking for a suitable phone for the wife, because her three-year-old clamshell Samsung was obviously about to kick the bucket. Let me tell you my wife is a very bright woman, an associate professor at the university, but at the same time quite the technophobe, who approaches the TV-remote with mistrust and scepticism! I got her the i-Phone 3GS, and she started to use it efficiently in no time, and loved it to bits!
At the end of the day, I think I made the right choice in both cases. She is not intimidated by her phone, and I am not feeling confined by mine (well, except for the memory that is)...