There’s an e-commerce revolution coming that will further blur the boundaries that have traditionally existed between buyers and sellers. That’s not necessarily a bad thing, but it may take some getting used to in terms of its potential impact on the relationships people have with one another on social networks.
MyBantu is an interesting little mashup, available as an iPhone app, an Android app, and a website. Its goal is to make shopping for anything, especially restaurants and movies, easier and more social. It uses Yelp API, Netflix API and various others to make it happen. It's very similar in idea to Siri, the "ultimate mashup" that Apple later gobbled up in the largest mashup acquisition ever.