Dual Booting with Ubuntu/Leopard - help?

Hi
I currently have my Macbook Pro (newest version as of Aug 09) set up with Windows XP and Leopard via Bootcamp. I don't use Windows almost ever anymore so I wanted to install Ubuntu on it. IE, just load Ubuntu over Windows. The windows partition is NTFS formatted. Before I attempt this, I was wondering if there are any simple-to-use tutorials out there. I have some experience with Linux, but it was years ago. Why I want to get back into it and learn a new OS again. Thanks for reading!