Abxtract
Google TensorFlow has created a visual neural network for educational purposes:
http://playground.tensorflow.org
This is certainly one of the most impressive visualization I have seen in machine learning so far. But I'd love to see more works on visualizing neural networks. E.g. scale it up for more complicated dataset such as MNIST.
Note: you have to hit play. Then dots are the training data and the orange and blue background color is the NN classification.