100% of PG articles make it here, lots of TC's make it here (although many don't hit the front page), probably half of the xkcd's do, and PB's generally make it here eventually.
Also, I omitted Matt Maroon before, but his articles generally get posted, too, even when they're little comments and not actually essays.
Search of SearchYC based on title on 30 TechCrunch articles from March 27-29 found 7/30 articles = ~25%
PG's articles get a huge amount of karma regardless, that should probably be botted but may never make it in time (I don't know how quickly the RSS feed is generated).
Also, I omitted Matt Maroon before, but his articles generally get posted, too, even when they're little comments and not actually essays.