When talking about what media to use to store archival quality images, people have very specific ideas. Many people -- including me -- point to CDs. People involved in mammoth digitization programs might talk about using hard drives for long-term storage, due to the space requirements. There is perhaps no correct answer, but rather an answer that first a particular situation. What is worth remembering, though, is that those files cannot be stored away and forgotten. They must be maintained or they will be lost.
By the way, "j" in her posting about this says:
Conservation OnLine provides lots of information about preserving various formats. It includes some items about CDs and digital files in its audio materials and electronic storage media sections.
Technorati tag: Digitization