Recently, I visited a Genius Bar in Manchester to have a problem with my keyboard fixed. The Genius inserted an external disk into the USB port, restared, held down my option key and a myriad of options came up including 'live' versions of Leopard and Tiger, a Restore Disc and various others. I thought that this technology, ImageBoot, was being released in Snow Leopard - MacNN and Macrumors posted "ImageBoot should let people boot from external storage or a secondary partition, with the option of choosing among several disk images at startup." The Genius simply selected the 'live' version of Leopard (which had a screenshot of it as an icon), and it booted just like normal to test Keyboard Viewer. How can I use this hidden feature they use with a simple external disk? Best, Rosie.