Microsoft has launched a 9-month test of video ads on shopping carts at 220 grocery stores in the Northeast. Offers are based on prior shopping history and online shopping lists, as well as location technology that delivers ads based on the shopper's location in the store.

Google is testing maps and coupon offers on gas pumps. 

For more info see Microsoft Takes Digital Ads to Grocery Aisles - Adweek

Photo: Media Cart Holdings

MyPoints in an online loyalty marketing program that enables customers to earn points-based rewards by responding to email offers, surveys, shopping online, etc.

ShopLocal provides users with a selection of timely online and in-store offers on their site, including products and up-to-date weekly sales, deals, and coupons for consumer electronics, apparel, groceries and more.

They also offer marketing solutions to advertisers.

Wize is a product comparison and shopping search engine which generates results pages based on product reviews.

Buzzillions is a product comparison and shopping search engine which provides results based on customer reviews.

PowerReviews is a shopping research engine which provides customer review solutions for ecommerce sites for free, "but, in exchange PowerReviews gets to aggregate their review data and use it on its own consumer-facing review site Buzzillions."

PowerReviews captures “pros”, “cons” and “best uses” in a structured form that is used to provide input at each stage in the shopping process — from finding to comparing to deciding on the right product to buy. PowerReviews also captures the reviewer’s buying “personality” — or affinity group — so that shoppers can get product advice from “people just like them.”

Source: Techcrunch

Retrevo is a product review and search service focused on electronics.

Bountii is a price search engine focused on electronics products.

Source: Techcrunch

Wishpot is a social network that enables users to save and share interesting products they find at any store or website with online lists.

Kaboodle is a social network focused on shopping.