apt-get install gnomebaker
While, this helpfully downloaded the aforementioned, installed it and created links to it in the Applications menu, trying to write a CD or DVD doesn't work. It would appear that there are some permissions errors and the app can't get access to the drive :o(. Running the app as root using sudo gnomebaker does work, but is hardly a workable solution in the long term!
I'll continue to browse the forum and blogs for some helpful hints, but at the moment, it seems to be: run it using sudo.