Q: Is there a way to manually manage music on the second generation iPod shuffle so that I can load music onto the iPod from more than one computer?
A: The first and second generation iPod shuffle models basically use manual management by default. While these iPod devices include an AutoFill mode to automatically fill up your iPod, this is simply a convenience feature for an iPod that is otherwise managed manually. In fact, with iTunes 8.1, AutoFill is now available for any manually managed iPod model.
To add content to your iPod shuffle from another computer, simply connect the iPod shuffle and drag-and-drop the content as you would for any other manually managed iPod. There is no “manual” option because the device is always in manual mode.