Shopkick has generated a lot of buzz recently for its smartphone app that combines location-based features with shopping. Soon, Shopkick hopes, when you walk into any of hundreds of retailers, their app will alert you to deals at that store, and reward you with 'Kickbucks' just for being there.
Mobile networking company Foursquare is the current belle of the tech start-up ball. It's attracting VCs who want to get a piece of its next fund-raising round. And media companies -- Yahoo in particular -- are rumored to be interested in buying it for as much as $100 million.