Google announced a new service called Google Shopping Express.
Google Shopping Express offers same day delivery in Manhattan, San Francisco, West LA, Peninsula & San Jose.
Right now, you can get a 6 month membership for free and get $10 off your first order.
Once you are a member, same day shipping is free. No catches. I'm sure it won't be free after 6 months, but prices have not been announced yet.
The last couple of times I have tried, I got the message that they are out of deliveries for the day so there is a limited number of people who can get deliveries every day.
HT: DansDeals