It's great if you have lots of money and storage space for multitudes of CDs or ZIP disks, but if not, reconsider this purpose for scanning your documents. There is one valid reason for scanning such documents, and that is to share them with others. If that's your reasoning, I recommend getting a CD burner and storing those images on CDs so your relatives can access them just as easily as you can. But this raises other issues, including accessibility. You will have the same problems in tracking digital documents as you do in tracking paper ones.
Photos are the perfect documents to scan and share with others.
Additionally, scanning photos can help preserve the images from deterioration so descendants can share the joy of seeing their ancestors. Most of the documents we bring home are photocopies, though, and don't need this type of protection. It may also be useful because, if you can successfully scan the text of a document, you can use and manipulate that text in your research. Maybe we'll see more drastic improvements in scanning software in another 5 to 10 years and be able to scan our genealogical documents for text. Meanwhile, I recommend we work on organizing our physical documents before we add an additional step to this organizing process.