Hackage: http://hackage.haskell.org/package/hArduino
GitHub:  http://leventerkok.github.com/hArduino 

Latest Hackage released version: 0.2

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Version 0.2, 2013-01-28

 - Rewrite the communication engine
 - Digital input/output implementation
 - Add switch example

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Version 0.1, 2013-01-14

 - Initial design
 - Blink example operational
 - Home page at: http://leventerkok.github.com/hArduino