It seems like a nice idea, they've got some issues getting from the exact pcb dimensions to the case, and the version i'm running is in inches only, but it looks like an interesting idea. But as with all good ideas, i'm curious if anyones actaully tried it yet? they've got a decent enough client list. My PCBCNC could probably cut the case out but i like this for small runs.
http://www.protocasedesigner.com/