Username or EmailPassword
With the notable exception of plasma, all other names are for library or subsystem which won't be that visible for the user.
As for the k-scheme, I note that tom didn't complained about the i-scheme of MacOSX. And I personaly see no problem in this, it's a like a brand.
IN OS-X the sheme is at least in an understandab le order:
iThis, iThat, iFoo, iBar.
With KDE you have:
Kthis, thisK, Khis, thiK.
A total mess.
But MacOS does not have:
iProgram environment, ibattery statusetc...
Annoying, isn't it?
Its not just most KDE programs that have that noming scheme, its all of them + plus every Komponent that is a piece of the system.
Why? Apps doesn't have to be named after a certain scheme.
KDE naming is a mess. Sometimes a letter is replaced with a K (konsole), sometimes a K is appended before (kcontrol), sometimes a K in the name is just written in upper-case (amaroK). KDE devs should really name their apps better instead of just desperatly trying to get a K in their names.
Apple apps usually have good names; finder (find files), iTunes (play tunes), iPhoto (manage photos).
KDE apps usually doesn't; Konqueror, K3B, Kopete etc.
The problem is, almost _every_ application for KDE has a K somewhere, while these iApps on Mac OS X are just a small set of multimedia-related applications, iTunes, iPhoto etc. It's not that all of Mac OS uses this "i".