I just recently purchased more stuff from my CafePress store looking to see the quality of the audio and data cd cases. I was not disappointed.
I designed two jewel cases, one for the data CD and one for the audio cd. The final product was a high quality result considering you don't need to buy any in advance. Some of the smaller text is harder to read, and some of the colors are a bit off (could be my fault) but overall the results are very satisfactory.
A more detailed review of my purchase can be found on the silverorange stuff site.
Next I would like to see what their printed books turn out like.