[glitchdout]

Here's an example that immediately sprung to mind: http://akinator.com/ . It's a game that guesses what person or character you're thinking of by asking simple questions.

[d23]

I really like that site, but I meant more from a developer point of view. For instance: how would I go about building akinator using one of these libraries?

[glitchdout]

Oh, that's what you were getting at. I agree. I would also love a step-by-step example of how to build something cool using machine learning.