Works for me:
Must have:
- Ubuntu 7.10 Live CD (or other)
- USB Flash Drive ( at least 1 Go )
- Windows Xp or Vista (

)
Insert the CD and your USB flash drive.
Boot on live CD.
Open a terminal window and type "sudo su" ( without quote ).
Type fdisk -l , note your flash drive letter ( sda, sdb, etc... ).
Type umount /dev/sdx1 ( x = your flash drive letter ).
Type fdisk /dev/sdx
type p to show the existing partition and d to delete it
type p again to show any remaining partitions (if partitions exist, repeat the previous step)
type n to make a new partition
type p for primary partition
type 1 to make this the first partition
hit enter to use the default 1st cylinder
type +750M to set the partition size
type a to make this partition active
type 1 to select partition 1
type t to change the partition filesystem
type 6 to select the fat16 file system
type n to make another new partition
type p for primary partition
type 2 to make this the second partition
hit enter to use the default cylinder
hit enter again to use the default last cylinder
type w to write the new partition table
Type umount /dev/sdx1
Type mkfs.vfat -F 32 -n linuxmint /dev/sdx1
Type umount /dev/sdx2
Type mkfs.ext3 -b 4096 -L casper-rw /dev/sdx2
Remove and Re-insert your flash drive.
Reboot your computer, with Windows.
Next, just follow this tutorial from pendrivelinux
http://www.pendrivelinux.com/2007/10/31/usb-linux-mint-install-from-windows/Install Mint on FAT 32 Part.
Add "Persistent Mode" to the "syslinux.cfg" like this...
DEFAULT persistent
...
...
LABEL persistent
menu label ^Start Linux Mint in persistent mode
kernel /casper/vmlinuz
append file=/cdrom/preseed/ubuntu.seed boot=casper persistent initrd=/casper/initrd.gz ramdisk_size=1048576 root=/dev/ram rw quiet splash --
Try this... Works for me

But this tip is just experimental, maybe dev like Clem (French too !) could do something more easy...
Linux Mint on USB Flash Drive rocks !
