You won't hear from the applicants that got interviews. PG manually deletes their "we got an interview" posts to prevent pre-interview poaching by other investors/companies.
97% of applicants get rejected. 3% of applicants get an interview. You can read all about it, along with about 30 blog posts of interview experiences, at:
3% and 97% are the only numbers I've ever seen written by Paul Graham himself. PG has also informed me that I'm wrong about the lack of reason for acceptance posts on HN. Apparently, such posts get deleted because of the large quantity of HN submissions that would result if YC allowed such posts.
97% of applicants get rejected. 3% of applicants get an interview. You can read all about it, along with about 30 blog posts of interview experiences, at:
http://ycuniverse.com/interviewees.php