partitions

active flag
Although not used by lilo, the active flag is set simply to indicate the main boot partition for debug / recovery purposes.
spare OS partitions
Planning a clean install to spare partitions, extra 1GB for GUI sans KDE install, so I may run GUI apps headless.
special partitions
/home/common and /home/mirror are served from this box and will be used by either OS, they will survive a re-install.
~$ /sbin/fdisk -l

Disk /dev/hda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hda1               1          32      257008+  83  Linux
/dev/hda2              33         416     3084480   83  Linux
/dev/hda3   *         417         672     2056320   83  Linux
/dev/hda4             673        9728    72742320    5  Extended
/dev/hda5             673         704      257008+  83  Linux
/dev/hda6             705         736      257008+  83  Linux
/dev/hda7             737         800      514048+  83  Linux
/dev/hda8             801         832      257008+  82  Linux swap
/dev/hda9             833         864      257008+  83  Linux
/dev/hda10            865         896      257008+  83  Linux
/dev/hda11            897        1024     1028128+  83  Linux
/dev/hda12           1025        1536     4112608+  83  Linux
/dev/hda13           1537        2560     8225248+  83  Linux
/dev/hda14           2561        4608    16450528+  83  Linux
/dev/hda15           4609        9728    41126368+  83  Linux

~$ df
Filesystem           1K-blocks      Used Available Use% Mounted on
LABEL=root             2056252    684116   1372136  34% /
/dev/hda9               256948    139508    117440  55% /var
/dev/hda10              256948     40660    216288  16% /usr/local
/dev/hda11             1028060    153748    874312  15% /home
/dev/hda14            16449988    486760  15963228   3% /home/common
/dev/hda15            41125076  20504544  20620532  50% /home/mirror
tmpfs                    63696         0     63696   0% /dev/shm

lilo.conf

~$ cat /etc/lilo.conf
# /etc/lilo.conf for slackware-11.0 on deltree 2007-01-30
#
boot = /dev/hda
root = /dev/hda2
read-only
compact
lba32
prompt
timeout = 30

default = 2.6.26.2a
#default = 2.6.25.15a

image = /boot/bzImage-2.6.26.2a
  label = 2.6.26.2a

image = /boot/bzImage-2.6.25.15a
  label = 2.6.25.15a

image = /boot/vmlinuz-ide-2.4.33.3
  label = slack-2.4.33.3

other = /dev/hda1
  label = service

other = /dev/hda3
  label = alt

# end