Buy an Axon, Axon II, or Axon Mote and build a great robot, while helping to support SoR.
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You only need 2 Photoresistors. Use one on one side and the other on the other side. If any of those touches the white line, then turn in that direction. Just connect them up to a microcontroller and program it or, connect each photoresistor in the path to the motor so it slows the motor when it sees white.http://www.radioshack.com/product/index.jsp?productId=2062590