Heh, I just read this today and tried a very simple form of it. Took me all about five minutes to do. All I did was take a scrap of steel that I had tried cutting with a hardy tool, but left half done. I'm glad I did, all that was in the steel was a groove about 1/2 a cm, which I took a dremel tool to, and dove tailed it. Looking baisically like this:
After doing this, I just stripped a Romex(?) copper electrical wire, and cold pounded the copper into the dove-tail. I tried to pry it out once it was in, and I was quite unsuccesful. I then ground with the wire, trying to dislodge it that way, and I was also unsuccessful. Here is the finished project, turned out to be a very nice inlay that took me about five minutes on my first try.
It's so COOL!!!