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Had you actually read through or watched the video, you'd notice that you can't just take someone's username and start guessing. They have a second layer that requires "out of band" authentication.

http://www.vidoop.com/vidoop_how.php

Also, it's more like 12 choose 2 but you cannot enter those two easily since: they change all the time and they're embeded in pictures.

I misread 12 as 15. But the blog post says you pick three images. So 12 choose 3, or 220.

OK, if you were willing to sit through their video, why don't you tell us about this second layer?

No, the order does not matter. You can enter code from the three slides in any order. I've checked at their website.

Even then, how is would that be more secure than a password?