How to Install Ubuntu As an Operating System in a USB pen drive

In one of my earlier posts i had told you how to install Xubuntu on your pen drive.Incase you are a pure ubuntu guy and you would like to install ubuntu gutsy on your pen drive.It is possible.One of the best features of this is that it saves whatever you do .Like incase you install java or change some settings in ubuntu.Even after you reboot the ubuntu usb , all settings would be intact.So its basically an alternative to your Hard Disk :D ..And ofcourse Ubuntu is more stable and is more highly recommended.You can do quite a lot of stuff with it.Also wanted to let you know that this usb ubuntu of mine was a life saver a few days back..I had to transfer some important documents but the nearest computer was totally infected(Windows of course :D ). So i just plugged in the usb , ubuntu automatically recognized the network and i could download my documents and work on it!!!..
So here's the link to the article to INSTALL UBUNTU ON A PEN DRIVE. Three cheers to the author of the article.Its written so beautifully and is so easy to follow.Anybody should be able to install this with no problems at all..
Cheers!!!