Can anyone who has attended a past Startup School share their experience? What's the general atmosphere of the event? Is it similar to other conferences you've attended? Does it offer value on its own merits, or is it simply a day-long sales pitch for YC?
If you are contemplating a startup or you're already doing a startup I would say it's worth attending. Outside of the interesting talks (which will most likely find their way online anyways), it's a great opportunity to talk to other like-minded people and hear about what sort of stuff they're working on.