ntfs-3g (the drivers for using NTFS in Linux) come as standard in Jaunty. If you open nautilus (the file manager) you should see your Windows partition/drive in the sidebar. It'll probably be listed as "19.9GB Media" or similar, depending on the size. Just click it (or double click, I forget) to mount it.
You can then move files on and off it just like a normal attached drive.
No need for the debian tutorial.