I'd like to boot KDE first and then boot windows xp. From what i've been reading i need to first boot windows then KDE, but not the other way.

Can anyone point me to some articles that discuss this topic or give me idea how to accomplish this?

KDE is not an Operating System. Are you referring to the interface that appears once you have logged in?

Maybe he's talking about booting a KDE-run Linux distribution. But even still, KDE is not an OS, but a suite of software.
If so, then you'll have to shorten the Windows partition(s) and allocate the free space to the Linux partition and the swapspace.

Relatively few programs are available for Windows yet; you can dual boot a Linux distro such as Kubuntu, Mandriva or openSUSE, all of which come with KDE4 or wait a few days and try the KDE4.4 Live CD from http://en.opensuse.org/KDE/KDE4

As long as you have 1Gb of memory, this will allow you to try out KDE4.4 without touching your Windows set-up; it will also install to the hard drive as long as you have enough space and you have defragmented your XP hard drive (which you will need to do before you install any Linux distro).

1GB? It depends on the OS you're using. IF you want to try out a frugal install, that's alright. But with most full installs, and even with frugal installs for larger distros such as SuSE and Kubuntu, you'll need way over 1GB of space, granted the entire system is on one disk. You need to take swap space into mind as well. If your computer is somewhat under high-end, then 1GB of swapspace is enough.

Edit: Oh, memory. I misread it for disk space. 1GB of memory is alright for KDE. Sorry for the misunderstanding... lol