Stumbled upon a product I designed last year for a Hackathon @ PepperTap : Online Grocery Delivery App.
Smart Cart is an intelligent Widget which converts a normal to-do list into a product filled cart ready to checkout.
It takes in account users preferences from past orders and browsing behaviours to suggest products. It even suggests complementary products and substitutes.
We designed & developed this product overnight and it was hell lot of fun :)