I built our old coffee table one apartment and one house ago. As a first effort it wasn't bad; wood legs on castors with a glass top and metal lower shelf. It was very early 90's. But like many projects I never quite finished it, the glass was never firmly attached to the legs and could slide if bumped by a leg, a dog, or more recently (and dangerously) by an energetic and highly mobile toddler. Joanne decreed the old table dangerous and it was dismantled.
So I designed a new one. I've been toying with the concept of lighted furniture for a while now. I like the idea of creating small discreet sources of low light scattered around a room and using point sources where more illumination is needed (i.e. for reading). One method of doing that is embedding lights within furniture. In the case of this table the light is provided by two 1W LED's. It shines both up and down. The light up is very pretty, but not particularly useful (you can't read by it). The light down illuminates the bottom shelf, in our case the home of our stack of current magazines.
I'm fairly pleased with how it has turned out and for a prototype it's pretty good. Right now it's sitting in Eurolite's showroom, so if you're in Toronto you can go and check it out.
Right now I'm building new slabs for the table top, the current ones are cedar (not a great material for table tops - too soft), the new ones will be butternut. They will have an improved method of holding the light in place. I'm also ordering some flat low voltage wiring to use for the lights, which will allow me to run the wireing to the table, up the leg, and to the lights and have it almost invisible.