I've added these 6 lines to /etc/fstab on this machine:
/home/larry/isofiles/ubuntu/10.04/ubuntu-10.04.02-desktop-i386.iso /mnt/ubu1004DL32 udf,iso9660 user,loop 0 0
/home/larry/isofiles/ubuntu/10.04/ubuntu-10.04.02-desktop-amd64.iso /mnt/ubu1004DL64 udf,iso9660 user,loop 0 0
/home/larry/isofiles/ubuntu/10.10/ubuntu-10.10-desktop-i386.iso /mnt/ubu1010DL32 udf,iso9660 user,loop 0 0
/home/larry/isofiles/ubuntu/10.10/ubuntu-10.10-desktop-amd64.iso /mnt/ubu1010DL64 udf,iso9660 user,loop 0 0
/home/larry/isofiles/ubuntu/11.04/ubuntu-11.11-desktop-i386.iso /mnt/ubu1104DL32 udf,iso9660 user,loop 0 0
/home/larry/isofiles/ubuntu/11.04/ubuntu-11.11-desktop-amd64.iso /mnt/ubu1104DL64 udf,iso9660 user,loop 0 0
May 2 19:49:11 fogtest exportfs[1100]: /etc/exports [2]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/images/dev".#012 Assuming default behaviour ('no_subtree_check').#012 NOTE: this default has changed since nfs-utils version 1.0.x
May 2 19:49:11 fogtest exportfs[1100]: /etc/exports [3]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/mnt/ubu1004DL32".#012 Assuming default behaviour ('no_subtree_check').#012 NOTE: this default has changed since nfs-utils version 1.0.x
May 2 19:49:11 fogtest exportfs[1100]: /etc/exports [4]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/mnt/ubu1004DL64".#012 Assuming default behaviour ('no_subtree_check').#012 NOTE: this default has changed since nfs-utils version 1.0.x
May 2 19:49:11 fogtest exportfs[1100]: /etc/exports [5]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/mnt/ubu1010DL32".#012 Assuming default behaviour ('no_subtree_check').#012 NOTE: this default has changed since nfs-utils version 1.0.x
May 2 19:49:11 fogtest exportfs[1100]: /etc/exports [6]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/mnt/ubu1010DL64".#012 Assuming default behaviour ('no_subtree_check').#012 NOTE: this default has changed since nfs-utils version 1.0.x
May 2 19:49:11 fogtest exportfs[1100]: /etc/exports [7]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/mnt/ubu1104DL32".#012 Assuming default behaviour ('no_subtree_check').#012 NOTE: this default has changed since nfs-utils version 1.0.x
May 2 19:49:11 fogtest exportfs[1100]: /etc/exports [8]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/mnt/ubu1104DL64".#012 Assuming default behaviour ('no_subtree_check').#012 NOTE: this default has changed since nfs-utils version 1.0.x