The MailChimp Node.js sample code by Pete Holiday explains with an application the way to interact with the official wrapper. It allows developers to set up a common environment for integration, make API calls, and display the results. Node.js wrapper available at https://www.npmjs.com/package/mailchimp-api
API service provider Mashery (a ProgrammableWeb sponsor) has launched a new app directory at SXSW which features apps built on Mashery hosted APIs. It’s a great thing for three distinct groups. First, it helps the API providers who partner with Mashery by encouraging API usage through the apps. Second, it helps app developers seeking to build an audience. Third, it helps consumers that might be interested in finding an app that uses a particular API. Granted, those would be your super savvy mobile app consumers, but that doesn’t seem so far fetched after a week at "spring break for geeks."