Burning photos to a CD and burning to a DVD are two different issues. What is your goal? Do you want a disc with music and transitions between pictures, or do you simply want a disc that allows you to view the pictures? If you want the latter, just simply burn a CD and place the disc in any DVD player that recognizes JPEG images. Once inserted, you can use the remote to view the pictures one by one. If you want to make a picture slide show with music and transitions, then you want to burn a DVD. In either case, your Mac comes complete with what you need. To burn a CD, simply place a blank CD into the drive, and when asked what to do with it, name it and click OK. You will now see an icon on the desktop of your CD. Locate your pictures on your computer and simply drag the files on top of the CD icon. If you have 50 pictures, your CD should have 50 separate picture files in it. Now either drag the CD icon to the trash (where you will be given a window asking you to "Burn" the disc, or choose the icon under the Apple logo in the upper-left of the screen and choose "Burn."
If you want to make a DVD with music and transitions, you will need to use iMovie and iDVD, which your computer has. These are part of the iLife package of software, and it is brilliant for home use. It's too complicated to give instructions here, so go buy a book about iMovie/iDVD. My favorite has been the "Missing Manual" book. Do a Google search for "iMovie Missing Manual" and you will find it.
My last computer was a dinosaur of a PC, with no burning capabilities. I installed a burner & lost all available space with it's software. Finally convinced to buy the iMac of my dreams, I have transfered all of my photos. I know I can create DVD shows of my photos or burn them onto CD. I tried to 'Find' burning software. Does anyone know if/what burning software comes on the new iMacs & what are the best type of CDs or DVDs to burn. Any suggestions...

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