Hardware to check out:http://www.sparkfun.com/commerce/product_info.php?products_id=8482http://www.sparkfun.com/commerce/product_info.php?products_id=8972…
Where to start:http://arduino.cc/Where to buy microcontrollers and sensors:http://www.sparkfun.com/commerce/categories.phpReferences for arduino projects:http://www.freeduino.org/Some example projects:http://www.sport4minus.de/blog/?p=152…