What is the point of SIGHASH_NONE?
The bitcoin wiki OP_CHECKSIG page describes the behaviour of SIGHASH_NONE like this:


  The output of txCopy is set to a vector of zero size.
  
  All other inputs aside from the current input in txCopy have their
  nSequence index set to zero
  
  Think of this as "sign none of the outputs-- I don't care where the
  bitcoins go."


The contracts page also talks about SIGHASH_NONE:


  SIGHASH_NONE: The outputs are not signed and can be anything. Use this
  to indicate "I agree to put my money in, as long as everyone puts
  their money in, but I don't care what's done with the output". This
  mode allows others to update the transaction by changing their inputs
  sequence numbers.


If I sign a transaction where all the inputs are SIGHASH_NONE then a miner can change the outputs to whatever he likes.  If any of the inputs are SIGHASH_ALL then the miner can't change the outputs.  So a group of people can each sign their own SIGHASH_NONE input to a transaction, send them privately to the coordinator who signs his own SIGHASH_ALL input before publishing the transaction.  That way the individual contributors don't need to know the destination address so long as they trust the coordinator.