A couple hours and 99 pages later of Google search results for "interview site:news.ycombinator.com", I have a database of all 25 blog entries of YC interviews ever discussed on Hacker News. Here they are:
http://ycuniverse.com/interviewees.php
I have nothing to gain by sharing this. I'm not trying to sell anything. Hopefully, these blog entries will help interviewees perform better. As YC interviews for YC S11 are still ongoing, I look forward to reading more of these experiences.