Board is green and includes 2 vertical gyro daughter-boards.
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Board is red and includes 2 vertical gyro daughter-boards.
http://www.sparkfun.com/products/9038
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Board is red and includes a single, flat, multi-gyro daughter-board.
http://www.sparkfun.com/products/9980
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This board is still being designed. It will be based on a faster chip with more IO pins, and will be a major upgrade. Should hopefully be available from SparkFun by Summer 2011.
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Other groups and individuals have built custom boards that are compatible with MatrixPilot, or run their own variants of the code.