Great set of demos for doing deep learning in the browser using a new library developed by +Andrej Karpathy. This makes it easy to try out deep learning on your data before doing a larger implementation. Andrej also gives some great high level explanations of what deep learning is and the different approaches that are available.
My new pet project I've been hacking on over Christmas break: ConvNetJS

(see demos that train Convolutional Neural Networks on CIFAR10,  MNIST entirely in your browser))

ConvNetJS is a Javascript library for training Deep Learning models (mainly Neural Networks) entirely in your browser. Open a tab and you're training. No software requirements, no compilers, no installations, no GPUs, no sweat.

http://cs.stanford.edu/people/karpathy/convnetjs/
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