As an SF resident and hyper-avid grocery delivery user, I welcome our new, Amazonian overlords.
I tend to get 1-3 deliveries from Amazon a week, so tacking on groceries to that list would not be a major problem. There's still a question of how you handle perishables like milk though. Plus, I've found that most delivery services tend to be incredibly variable in their produce quality.
For those curious about the startups in this area, I did a bit of a writeup where I raced three services head-to-head against each other. http://teejm.com/the-great-grocery-game
Amazon handles perishables by having refrigerated trucks, and putting your groceries in insulated plastic containers that also have cold packs, as needed.
It all works pretty well as long as you don't get too crazy about how long you leave the groceries outside.
I tend to get 1-3 deliveries from Amazon a week, so tacking on groceries to that list would not be a major problem. There's still a question of how you handle perishables like milk though. Plus, I've found that most delivery services tend to be incredibly variable in their produce quality.
For those curious about the startups in this area, I did a bit of a writeup where I raced three services head-to-head against each other. http://teejm.com/the-great-grocery-game