We submitted our app in October not expecting anything and got asked to come talk to YC. We put together a tight demo, couldn't sleep the night before, waited until late Saturday night after the interview to hear they'd decided to pass (it's ok, we still heart YC), and pressed on. We've been cranking ever since returning from Cambridge to roll out the PriceAdvance FireFox addon for the holidays.
We've just launched our beta! And we just landed on the front page of LifeHacker.com (woohoo).
Anyway, we'd love to get some more feedback, comments, suggestions. Thanks!