There are some cheap and slim DVD burners at http://www.centrix-intl.com
There are some kits so that you can build your own, but I am unsure if the Q1U can provide enough power to burn a CD/DVD. From what I recall it takes much less power to read a CD as opposed to burning one. Some slim burners require the user to plug in both USB ports and that might be hard to do on the Q1U.
Anyone have any experience with this? I am interested in purchasing a slim DVD burner that is solely USB bus powered as I don't want to carry too many power adapters and cords with me when I travel.