"This is a bit tangential: Every start-up that YC funds is potentially worth an essay. Isn't that why they are funded? They solve a problem that nags many." --ChaitanyaSai http://news.ycombinator.com/item?id=192730
I think it would be interesting to see what PG thinks about the startups they fund.
Why pg and the others at YC picked those of the groups they interviewed; what about the product was it they liked; what wasn't right; how did they see the people and product grow; etc, etc.
I of course understand this would be a lot of work. But it would be quite interesting. It might be easiest to start with the current group and keep a journal on them, and refine it after the current period is done and then publish.
Stay the course, pg :)