Linux Live USB Creator is created by Thibaut Lauzière and available from
http://www.linuxliveusb.com
This video briefly goes through using 'Linux Live USB Creator' to create a persistent bootable USB Linux environment. LiLi supports over 360 different distros including, but nowhere near limited to :
Ubuntu 10.04
Parted Magic 2012_2_19
CentOS 6.3
Netrunner 4.2
Peppermint OS Two
CrunchBang 10 "Statler"
SystemRescueCD 2.5.0
Scientific Linux 6.2
Clonezilla Live CD 1.2.12-10
and obviously plenty more. If your favorite is not officially supported, chances are it will work anyway if you have a local copy.
See this video if you need to create a multi-bootable USB stick -
• How to create a Multiboot USB using SARDU