It would be rather nifty if I could setup ubuntu to use one of the USB ports as a slave rather than a master. That way I could set it up to run as a USB hard drive.
An advantage of this is using my linux box that is gathering videos online and connected to other shares around the house, give that data to my TV or DVD player that can read from USB stick or HD.
I am sure it is possible, but I am not sure about the Hardware requirements as I think it takes a specific kind of USB device to be both master and slave. N900 Maemo linux does it, perhaps we can too.
This give a little insite into it.
http://www.linux-usb.org/gadget/