Every batch someone from YC does a Q&A.
Additionally YC partners give a lot of good startup advise at events, twitter etc.
We wanted to create a wiki of all YC related Q&A. You can submit any more by emailing askmeanything.me@gmail.com and we will have it posted with due credit to you and the original source. Also please share any feedback. We loved reading all of them. Hope you like it too!