I can't see the point either, just seams like a waste disk of space if you ask me. It's been a while since I used Ubuntu but I'm sure there's meta-packages to add/remove the various DE's:
# apt-get install ubuntu-desktop
I spend most of my time playing with Linux these days (I'll be a SysAdmin one day ) but I'm still making multi-boot disks now and again... I'm just using my USB stick more now.
I'm kinda hooked on grub4dos at the moment, it's not as attractive as syslinux but what it lacks in aesthetic appeal it makes up for in features. I just wish they'd add more of the features from Super Grub Disk (USB Shift etc).
Is this a remastered Kubuntu livecd?