> I then started X, and got twm. The NetBSD chaps at the Wakefield RISC OS
> show were all running KDE, but I cannot find this. Perhaps I am looking
> in the wrong place? Could someone tell me if I am using the wrong
> version of the NetBSD port in order to have the KDE? How do I obtain
> KDE or Gnome?
> 
NetBSD is pretty light on what is installed by default to give you more 
choice about the packages you install.

There is a KDE 1.1.2 package for NetBSD 1.5 (which will be fine for 1.5.2)
but if you want a more recent version you will need to compile it yourself. 
This is pretty easy if the NetBSD machine has internet access and has pkgsrc 
available.

I think doing a 

pkg_add ftp://ftp.netbsd.org/pub/NetBSD/packages/1.5/arm32/All/kde-1.1.2nb1.tgz

will download KDE 1.1.2 and all its dependencies and install it on your system.
Be warned that this will probably involve some big downloads.

Good Luck

Mike