# Read as many essays as you can that PG has written. Watch any videos you can find as well. Get a sense of his style.
# Research previous YC companies. Take a look at the types of companies YC has funded and see where you could fit in.
I think it comes down to answering this question: Do I want to do my startup, or do I want to be a YC company? If it's the former, then don't spend time trying to study and cram on your YC/PG knowledge, unless that info will be useful to your company. It's not a trivia game, after all.
If the answer is the latter, then by all means read up and prepare for the application/interview process, as you'll need every shred of advantage you can get. Everything is riding on the application and interview. It's a risky bet, but at most you'll lose a couple weeks effort if you don't get accepted, and you can re-apply in a couple months time.
I suppose it doesn't hurt to do your research, but I think YC applicants who see YC as an avenue to do their startup, rather than the reverse, are better off just working on their idea and trying to get closer to a release.
Anyways, good luck with everything and thanks again for sharing your experiences.
(Note: I'm not singling listia out here, as I have no idea what their answer to the question would be. I'm just suggesting that all YC applicants ask themselves that question, be honest about the answer, and use that knowledge to help decide how much effort will be spent on the YC application.)