We recently released a mobile app for iOS and Android called "Event Check-In for Constant Contact", which is now available in both the iOS App Store and Android Market. I thought I would share the complete code for this app as well as the beginnings of a Constant Contact / Sencha Touch mobile SDK that I created for this and future projects. Anyone is welcome to contribute to either project on GitHub (see below).
Check out the code on GitHub:
Packaging instructions are on the wiki tab and in the README file
Currently supports Event Marketing APIs - let's add more!