it is PCLOS 2010.12 .iso
I used the Live USB creator in the distro.
The source was the live CD.
It is a 4 gig usb key, formatted to ext3.
It boots okay without persistence.
Here is the menu.lst
timeout 10
color black/cyan yellow/cyan
gfxmenu (hd0,0)/boot/gfxmenu
default 0
title LXDE
kernel (hd0,0)/LXDE_0/vmlinuz livecd=LXDE_0 fromusb root=UUID=eae1f05a-d32d-40e2-a550-a8cc62593ad4 acpi=on vga=791
initrd (hd0,0)/LXDE_0/initrd.gz
title LXDE with Persistence
kernel (hd0,0)/LXDE_0/vmlinuz livecd=LXDE_0 fromusb root=UUID=eae1f05a-d32d-40e2-a550-a8cc62593ad4 acpi=on fstab=rw,noauto vga=791 changes_dev=UUID=eae1f05a-d32d-40e2-a550-a8cc62593ad4
initrd (hd0,0)/LXDE_0/initrd.gz