If all you want are the image files export them via the File ➙ Export ➙ File Export menu option to a folder on the Desktop. Burn that folder to disk using the Finder.
Note: If you want the original version of the photos set Kind = Original. If you want the edited version if the photo has been edited then select Kind = JPEG. You can also check the two metadata boxes in case you might need to access the metaedata from them at some time.
Thanks very much for your helpful input. I take on board what you are saying but are you also then confirming that burning the contents of a smart folder to a DVD in the "to be read by iPhoto" format offered cannot actually be done if the desired end result is to have just the photos in the smart folder? I thought that was one of the purposes of the smart folders, it seems very weird to be able to filter the images down to what you want but then not to be able to burn just those image in an iPhoto readable format?
Burning them using the finder it just seems to me that iPhoto is just being used as a file sorter/filter.
When you did the burn did you select just the Smart Album icon in the left hand pane before using the Share ➙ Burn menu option? What version of iPhoto are you running?
I just ran a test in iPhoto 9.4.2 burning a smart album. What I got is shown in this screenshot:
The original SA had 232 photos in it. The SA in the disk "mini" library had the same 232 photos but also the 40 Events that those 232 photos came from.
Make sure you select just the Smart Album in the left hand pane before using the Share ➙ Burn menu.