If your burn the CD from the Finder (OSX 10.2) it will be readable by "dark side" computers. You should export the files you want to share to a folder on the desktop. Then, while in the Finder, insert a CD in the drive and select Action: Open Finder and name the CD. Then drag the image files from the folder to the CD. When the transfer is complete, drag the CD to the Trash, which changes to the burn icon and your CD is burned.
It has to be burned from the finder, NOT IPhoto.
Good Luck.