This tutorial is the best one I've seen for an Dual Boot Ubuntu install with Vista already installed on your computer. Comes with step by step instructions with screen shots for the novice installer. Shows how to partition the hard drive in Vista before you go to install Vista and holds your hand through the Ubuntu install With screen shots and step by step instructions through the whole process. It would have saved me a lot of headaches if I would have found this earlier.
How to dual-boot Vista with Linux (Vista installed first) -- the step-by-step guide with screenshots
Best tutorial for installing Ubuntu with Vista already installed
