There's a great article on
Smashing Magazine that can really inspire you when it comes to designing a multi-touch interface.
Often creative and truly remarkable design solutions remain unknown because we, designers, simply overlook them. Being busy with our own projects, we sometimes try to grasp the intuition behind (probably) complex and cluttered code of other designers to understand how they manage to implement particular design ideas. In fact, by just observing the code of other developers we can learn a lot from them; we can find interesting ideas and improve the quality of our work.
The article goes on to talk about
five really clever interfaces, maybe they can inspire you.