This is way cool and I really want one!
This awesome desk lamp looks just like the game. The elusive straight piece serves as the power source and as long as the rest of the pieces are partially touching it or each other, it will light up. You can arrange and re-arrange your lamp pieces however you would like to. It's currently in the pre-order stages for around $47. I want one for the studio...but with Moon here, I can't have nice things.
Want one? Here's where I found it: http://www.firebox.com/product/5339/Tetris-Light