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Impressive that it doesn't just take the best guess; it also informs you of its alternative hypotheses:

Update:

Reading your blog post, I see that this is a wrapper around highlight.js, which is doing the language-guessing (including the second-best guess): http://softwaremaniacs.org/wiki/doku.php/highlight.js:api

OP here. I can't take credit for that, though. ;-)

It uses the highlight.js API for making the guesses, which provides the 2nd best option as well. :)

In conclusion, the site is a very good idea, but highlight.js is really too bad for this kind of use. Raise a ticket on highlight.js