I haven't tried it yet, but on page 43 of the "Getting started guide", under section 1, it says" there are 5 options under the export preset menu, one of which is "Burn full size JPEGs." This option "exports your images as full size JPEGs and then automatically launces your disc-burning software."
Is that what you were looking for?
Thanks for the info Jim. I was not aware of this, but I was hoping to be able to export images as a slideshow, not as images that the viewer would need to navigate manually.
I know there are apps that will do specifically that (PhotoDVD I believe is one) so I thought there might be a good chance that LR would also offer this facility.