[2]TestDrive is an Ubuntu application that is especially designed for non-technical users to easily download and run the latest Ubuntu development daily snapshot in a virtual machine. We've covered TestDrive (as well as installation istructions) HERE.
TestDrive runs the daily Ubuntu .ISO in QEMU by default so if you also have VirtualBox installed, it is a bit messy as you will get the following error each time you try to run VirtualBox:
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http://www.webupd8.org/2010/02/how-to-use-testdrive-with-virtualbox.html [3]