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I think Amarok is by far the most impressive KDE app that could pull in new users. However, a lot of people are tied to iTunes or Windows Media through DRM.

K3B is very nice, but most people get free burning software with their computer, and that wouldn't really cause someone to switch IMO.

KOffice has the potential to be very impressive, but it isn't quite there yet. I know they're planning big things for the 2.0 release.

Kontact is another app that has the potential to replace Outlook, but isn't quite there yet.

And I think Konqueror/Dolphin may end up being popular on Windows/Mac as well. Konqueror may be the 1st good Webkit browser on Windows (Safari sucks there)

So for the time being, Amarok is the only serious contender. (and not yet available for KDE 4, apart from the current alpha).

Whether or not Konqueror will switch to webkit remains to be seen. My impression is that the KHTML devs are still unwilling to abandon "their" child in favour of Apple's fork. For the moment I would clearly prefer Safari for Windows, as it works with all those popular Web 2.0 sites and Konqueror doesn't, mainly because its Ecma/JavaScript engine is not state of the art.

Yes, K3B would be nice, provided all the command line tools it uses work on Windows. I believe that K3B heavily relies on HAL for Hardware detection, which if my understanding is correct would limit its platform independence.

I honestly don't believe that Koffice will make it. Honestly, KOffice has been around almost as long as KDE itself and it never really stabilised to a degree where I would entrust my valuable data to it. I don't believe it has a chance against the almightly OpenOffice.org.

Dolphin? Its basic functionality is too similar to Windows Explorer to make it a serious contender, I fail to see which killer features would tempt Windows users to use it to replace their default file manager.

I'd say you have missed lots, the quality and diversity of KDE applications are impressive. Some of the applications in the default KDE modules are good examples, like the kdeedu module with applications like Marble, Kalzium and KStars. Koffice shows lots of promise, Krita is one application going to raise eyebrows on windows users. Kate are by many considered a better editor than Emacs and Kontact/KMail/KOrganizer compares very well against similar applications.

In addition you have the range of high quality 3rd party KDE applications. Applications like TaskJuggler, digiKam, KTorrent, Semantik, Tellico and BasKet Note Pads.