Yes it installs both of them. Take care to select the "Desktop Environment" using the Space key, because it appears to be selected and actually it's not.
If you prefer only one DE you can install only the base system, restart and than login as root. After this install a DE with the following commands (for a 2-CD Set you can install either GNOME or KDE):
For KDE:
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apt-get install x-window-system-core kdm kde
For GNOME:
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apt-get install x-window-system-core gdm gnome
You can also use kde-core and gnome-core as far as I remember but I wouldn't do that since most applications like KPackage won't be installed by default.
Now I never installed over a network, but it should be the same, except the fact that your sources.list should differ. I don't know much about this. Hope this helps.
LE: I was using Ubuntu too, actually i used both Ubuntu and Kubuntu, but since Flight 7 I switched to Debian. When Dapper is out I think I'm going to switch back, or I don't know. Maybe I'll install Etch, we'll see.
