No, Shapeways doesn't have any materials that are conductive at this time for low voltages. Other than Stainless Steel and Sterling Silver of course. As we speak though, several companies are working to come up with good methods and last I heard at least one company, Stratasys, has come up with a viable method.
I'd say that within one year this technology will be available to everyone. It's going to be AMAZING! I CAN'T WAIT!
As for the projects you saw, can you post a link or two? I'd like to see what's being done. Things are progressing so quickly when it comes to the implementation of 3D printing by society that it's getting difficult for me to keep track of it all!
I prefer to know nothing about everything rather than everything about nothing.