With Photomatica you can store images of pictures stored in a Photo CD. You can view them at any time by clicking the "Open Picture" in the Photomatica main window.
Photomatica will remember in what CD the images are stored and ask you for it.
NOTE: It is important to unmount (by dragging the icon into the garbage can) all previously seen Photo CD. Otherwise you will be force to swap from one CD to another. This is because ghost images of previously viewed PhotoCDs are left on the desktop when they are ejected.