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And then, there's the nautilus burning interface: A "virtual" directory. Sure, you and me know that you should copy & paste the files there. There's only a not-clickable "burn" button. Nothing informs users that they're inside of a "burning app". It shouldn't be to hard to put a small text there: "Drop here the files that you want to burn" or something.
The nautilus burning interface is very similar to the XP interface. So if people are having problems with Gnome then they most certainly have problems with XP. I don't think it is too confusing considering there is a big "write to disk" button in the window. That being said I prefer using Brasero. I am used to having another program to burn CD/DVDs with.