High praise for Instacart from PG:
Incidentally, of all the startups we've funded, Instacart is one of the ones we ourselves use most. Jessica can't stop talking about how great it is. You learn how useful grocery delivery when you have small children like we do, and Instacart is by far the best option for this.
Instacart is one of those rare products that's surprisingly great. I.e. you don't realize how good such a thing could be till you try it. A lot of the best startups have this quality. I wish we could figure out a way to identify them when they apply to YC, but at the moment I admit we can't.
-- PG via Hacker News
Instacart - now delivering groceries in Palo Alto, Mountain View, and SF