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Fwiw, here are two light-weight feature-based recommendation engines I built for Node.js (for situations where you have the cold-start problem and therefore can't rely on user/item based collaborative filtering): Alike [1] and Look-Alike [2]

[1] https://github.com/axiomzen/Alike

[2] https://github.com/axiomzen/Look-Alike

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Thanks for sharing. What do you mean by the "cold-start" problem? Just want to know exactly when I can use your engines.

Just speculating: not having a recommendation when you first begin because you don't have any data.

Exactly right. I borrowed that term from Chapter 2 on Collective Intelligence [1]

[1] http://shop.oreilly.com/product/9780596529321.do

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