I watched the video, but then read further down.

"We even wrote a little app to continuously flash a list of potential YC partners’ questions every 10 seconds, training our brains to not go too long-winded with our responses."

Was that the publicly available app? That was you guys? I used that app. It was really helpful for me. My Google skills are not working for me today as I fight off this flu+NyQuil induced hazed. If anyone has that link and can post, you'd be doing many people a favor.