CreateSpace's Disc on Demand service is similar to print-on-demand -- albums are created as customers order them, eliminating the need for pre-built inventory. More than 20 record labels are participating, including EMI Music, Sony Music and Warner Music Group.
This is a perfect example of the "long tail," where the items that normally wouldn't be sold because they don't sell enough to stock can be now be made available, sold at a profit, because of Internet.
It's so nice to see most of the labels participate. And why not? It's another revenue stream as long as you can find the masters.