This 'thing' uses too much non-LEGO elements... but still considered the video worths a mention here. 
Tetris-Bot is a Tetris-playing robot. Now robots play games for us!...
It consists of a DSP board to analyze images coming from a camera, and a three-finger NXT robotic hand that presses the keys on the computer keyboard.
The software running on the DSP recognizes the new shapes falling and finds the best place/orientation where they fit. Then the instructions are communicated to the NXT robotic hand, via the outputs LEDs on the board and a light sensor connected to the NXT brick.
Very original, at least!
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Considering that the Lego Education store sells (and endorses) Tetrix elements (http://www.legoeducation.us/store/default.aspx?groupID=127&bhcp=1 ), one should not dismiss this creation as being sub-standard. It many ways, it's SUPERIOR to anything that could be made with 100% Lego elements.
Sorry, if my words look like diminishing the value of this work.
It was not my intention at all! Otherwise it won't be here also. :)
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