When it comes to the partitioning, I select Manually edit partition table. I create(thats the howto speaking vin not me) the following partitions:

    * /boot 100 MB (Primary) (Location for the new partition: Beginning) (ext3) (Bootable flag: on <-- important, otherwise your system will not boot!)
    * swap 1GB (Logical) (Location for the new partition: Beginning)
    * / 2GB (Logical) (Location for the new partition: Beginning) (ext3)
    * /vserver the rest (Logical) (Location for the new partition: Beginning) (ext3)

(Side note: You can also install everything in one big partition (as described here: http://www.howtoforge.com/perfect_setup_debian_sarge), but then you have to keep in mind that the Grub stanzas I describe in this howto are slightly different. For example, when I write that I add 


title        Xen 3.0.1 / XenLinux 2.6.12-xen0
root        (hd0,0)
kernel        /xen.gz dom0_mem=65536
module        /vmlinuz-2.6-xen0 root=/dev/hda6 ro console=tty0


to /boot/grub/menu.lst then you should probably use

title        Xen 3.0.1 / XenLinux 2.6.12-xen0
root        (hd0,0)
kernel        /boot/xen.gz dom0_mem=65536
module        /boot/vmlinuz-2.6-xen0 root=/dev/hda6 ro console=tty0

NOW THIS IS ME speaking here below is what my menu.lst looks like at the moment



## ## End Default Options ##

title		Debian GNU/Linux, kernel 2.6.8-2-386 
root		(hd0,1)
kernel		/boot/vmlinuz-2.6.8-2-386 root=/dev/hda2 ro 
initrd		/boot/initrd.img-2.6.8-2-386
savedefault
boot

title		Debian GNU/Linux, kernel 2.6.8-2-386 (recovery mode)
root		(hd0,1)
kernel		/boot/vmlinuz-2.6.8-2-386 root=/dev/hda2 ro single
initrd		/boot/initrd.img-2.6.8-2-386
savedefault
boot

### END DEBIAN AUTOMAGIC KERNELS LIST

# This is a divider, added to separate the menu items below from the Debian
# ones.
title		Other operating systems:
root


# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/hda1.
title		Ubuntu, kernel 2.6.12-10-686 (on /dev/hda1)
root		(hd0,0)
kernel		/boot/vmlinuz-2.6.12-10-686 root=/dev/hda1 ro quiet splash 
initrd		/boot/initrd.img-2.6.12-10-686
savedefault
boot


# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/hda1.
title		Ubuntu, kernel 2.6.12-10-686 (recovery mode) (on /dev/hda1)
root		(hd0,0)
kernel		/boot/vmlinuz-2.6.12-10-686 root=/dev/hda1 ro single 
initrd		/boot/initrd.img-2.6.12-10-686
savedefault
boot


# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/hda1.
title		Ubuntu, kernel 2.6.12-10-386 (on /dev/hda1)
root		(hd0,0)
kernel		/boot/vmlinuz-2.6.12-10-386 root=/dev/hda1 ro quiet splash 
initrd		/boot/initrd.img-2.6.12-10-386
savedefault
boot


# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/hda1.
title		Ubuntu, kernel 2.6.12-10-386 (recovery mode) (on /dev/hda1)
root		(hd0,0)
kernel		/boot/vmlinuz-2.6.12-10-386 root=/dev/hda1 ro single 
initrd		/boot/initrd.img-2.6.12-10-386
savedefault
boot


# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/hda1.
title		Ubuntu, kernel 2.6.12-9-386 (on /dev/hda1)
root		(hd0,0)
kernel		/boot/vmlinuz-2.6.12-9-386 root=/dev/hda1 ro quiet splash 
initrd		/boot/initrd.img-2.6.12-9-386
savedefault
boot


# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/hda1.
title		Ubuntu, kernel 2.6.12-9-386 (recovery mode) (on /dev/hda1)
root		(hd0,0)
kernel		/boot/vmlinuz-2.6.12-9-386 root=/dev/hda1 ro single 
initrd		/boot/initrd.img-2.6.12-9-386
savedefault
boot


# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/hda1.
title		Ubuntu, memtest86+ (on /dev/hda1)
root		(hd0,0)
kernel		/boot/memtest86+.bin  
savedefault
boot


my QUESTION which of the grub XEN examples do i put in my menu.lst?