This is the official Python library for interfacing with the Todoist API from a Python application. Todoist is an online task manager that enables users to organize, schedule, maintain, and prioritize personal tasks. The Todoist API can be used to integrate Todoist into other applications.
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.