Even if the images have been scanned, it's important to keep track of them, back them up and be prepared to do what it takes to make them accessible as technology changes. I've just figured out that my current PC with Vista is refusing to acknowledge jpegs on CDs, including a large number of Kodak Picture CDs. I also have a few Kodak Photo CDs from the early 90s and I am able to open those PCD files.
I'm sure I'll find a solution and am happy that it's not the CDs - no problem with backup PC running XP.
I have a blue million (exaggeration) slides and negatives yet to be scanned. Scanned a hundred or so on my Canon 8600F a few years ago and the results were pretty good but it is a tedious job.

Hitching a ride over Cheasapeake Bay on the back of a tow truck in 1981: