Kevin Kelly has posted a detailed explanation of the process by which you can get your self-published DVD, CD or book listed on Amazon.
1 Get an ISBN (for a book), or a UPC (for a CD or DVD). For one book it costs $125, for one CD, $55, for one DVD, $89
2 Get a barcode based on the ISBN or UPC. Costs $10, or may be included in UPC
3 Sign up with Amazon, $30 per year
4 Duplicate your stuff; include the barcode on the outside
5 Ship two copies to Amazon
6 Send cover scan
7 Track sales
8 Register it (optional)
Canadian publishers, including self-publishers, can get ISBNs for free by going to the Library and Archives Canada. Australian publishers can get a one off ISBN for AU$33 plus registration from the ISBN Agency, blocks of ISBNs are cheaper and barcodes are AU$38 each — via boingboing