The Raspberry Pi is a very new and very exciting bare board ARM-based Linux box, for $25. It's the size of a credit card. And it does not come with a case. So what do you do if you want a case. Well, if you have some 3D design skills, you load up your favorite 3D modelling software, design a case, export the .STL file, and log into Shapeways, a 3D Printing Bureau Service. Hey presto, you can have all the cases you want for all of your $25 Raspberry Pi computers.
And if you thought this was a one off, take a look at all of the R-Pi cases starting to appear on Shapeways.