If I'm not mistaken that printable DVD/CD media is for use with a printer that can print to the tops of the CD. Like the inkjet DVD/CDs.
My roommate has an espon printer that can do this. The media is more expensive but well worth it if you dont like your the DVDs in your DVD collection to have hand written labels with a sharpie. Makes your DVD movie back-ups looks almost like the original.
You can order jewel cases, inserts and the printable media at
www.cdrom2go.com, however there could be better places to get it.