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Wasn't there another one of these that worked the same exact way posted a few days ago? http://news.ycombinator.com/item?id=3616763

Similar, but I missed this post.

I thought it was familiar, too ;-)

What do you actually use as features for training? Just the words in the title?

Yup!

You might want to take a look at my implementation. I use the content of the linked sites via viewtext.org. This is probably more reliable.