How to go the other way round and expand your mobile app into a full fledged desktop web app experience. What to put in the mobile app, what on the web and how to make the experience of switching between both as seamless as possible. All that while supporting multiple mobile platforms, in our case Android, iPhone, Nokia Maemo and Palm Web OS. Where the complexity traps are and where a lot of apps go wrong. The talk will focus on the usability perspective of guiding the users to use both platforms with the most gain and ease.