How to install Zorin OS (or other linux) on a USB for boot?

I was wondering how I should go about to install linux on a usb and boot it from there.
If i download the .iso and mount it and install on to a USB, would I still be able to use the USB for content storing along with booting from the USB?
Instructions and tips are needed, thank you very much in advance.
Edit. P.S. I wish to continue to run windows on main. However I’ll probably be spending more time on linux.
Answer #1
You can use Unetbutin
http://unetbootin.sourceforge.net/
Answer #2
I don’t see Zorin OS as being one of the OS supported? Hm…
Answer #3
Lightz replied: I don't see Zorin OS as being one of the OS supported? Hm...
I’ve never used Zorin that way, but this guy has by the looks,
http://asakpke.blogspot.com/2011/03/run-zorin-osother-linux-iso-file-from.html
Answer #4
Oh so it is compatible… Alright, thanks for your answer and your dedication to helping me out, it’s greatly appreciated. If anyone else has anything to say, please say so!
Answer #5
You could use this app too:
http://www.pendrivelinux.com/universal-usb-installer-easy-as-1-2-3/