I found it through BoingBoing, but couldn't be bothered making one that looked so flash. I just wanted one to work, quick and easy. So all credit to Tetranitrate for the concept and what follows is a quick and easy solution to get a 'similar' result.
This Instructable shows you how to turn a glass chess set into one with glowing pieces that go out when you take them off the chess board.
40 LEDs $7.50 Australia (I love Jaycar - electronics supplier)
a resistor or two Free from junk
some copper wire 2m maybe. Free from junk
glue - I used Crystal Clear Araldyte $17.00 or so. Have heaps left.
a glass chess set $5.00 from toy store
Unwanted phone charger Free from Junk - if you don't have one, a friend will.
Solder Free from around
If you have glue, the rest should be less than $15
Soldering Iron (can manage without)
Pliers for twisting wire
Knife for stripping wire
Something to cut wire with
Some soldering is required but if you can't, you could still get a working one by just twisting the wire.
Took me about 4 hours to assemble.
Step 1: Get some copper wire
I got mine by using a cutter knife to slice the edge off some electrical cable and then peel the plastic off to expose the wire.
I then pulled the wire out of the plastic.
Wrapped it around the chess board with about 3cm/1 inch going past the edge of the chess board. I did this to get the correct length.
Cut the wire at the desired length. Remove it from around the chess board and separate the wire into strands. You will need 16 strands of copper wire. The stuff I used had strands about the same thickness as wire in a (twistem, bread tie, freezer bag wire).