Now we're getting there! Advantage is a very powerful device, no doubt. It's also absolutely massive. 359 g! It's not really the same sort of device as an iPhone at all.
Kaiser is more comparable. Still larger and heavier (160 g) though. Also has a screen half the resolution of an iPhone and, as does the Advantage, lacks the UI and hardware aesthetics (which I personally think are very much better). Also lacks iTunes integration and GBs of integrated storage.
That's not to say that the iPhone is better than the Kaiser or Advantage in every single way. Each of the three has its, ahem, advantages. But to my mind there is no single WM device that's better than the iPhone in all ways and there are probably no current WM phones that are bested by the iPhone in every department either. It's about the blend of what devices can do and how well they do those things. Silly to think otherwise really.
Once again it depends on who you are...in my case for example having a phone screen 2.5" or 3-3.5" makes no difference...my home laptop is 14" my work screen is 20"...3.5 inches doesn't do much more for me if I want to call someone or surf the internet. When I want to do serious stuff I go to the REAL computers.
The iTunes integration is a no-brainer - i don't use that software except on acs because it alrady is integrated..other wise I use better sotware. Thata may be a plus for ppl hooked on iPods, but for those who aren't 9esp if you download rather than buy music) it's a nonissue.
Integrated storage is nice now..but it limits the machine. if you ever want more than 8 GB you MUSt buy a new iPhone whilein my case 16 GB SDHC cards will be available soon and I can get 8 GB right now for less than $100..so add that to the $399 for a treo 680 which comes iwth a 1 GB card and it's the same as a 4GB iPhone (but of course no multitouch).
If you focus on the UI then fine - that's your bag on what makes a good phone. I like nice GUIs but after a week you even forget that they're even there,much less nice and it's about function (at least that's how it is with OS X Tiger and Vista for me).
Hardware aesthetics is subjective as I think curved devices fit my hand better than square ones (e.g. BB curve, treos which curve to the back, better fitting the shape of my irregular cupping palm)
Off topic(?) someone mentioned a good point about the "real internet" keynote comment. There is a reason other phones have not gone the "full" internet road - pl on the road want quick news akin to RSS not fullvblown pages to scroll through while grabbing a cup of coffee on the way to work. Mobile sites are best for mobile uses imo.