Check out Sana's Physionet Challenge!
The PhysioNet/CINC 2011 Challenge is an open and free event with the aim of stimulating and advancing computational research in cardiogy. The focus of this year's challenge is in designing an algorithm in Android that can estimate the quality of heart signals recorded from cell phones using Sana's software. Only basic programming is required to start modifying an open source Android App provided by PhysioNet/CINC. The top competitors will receive US$2000 in cash and a chance to present their work at the Computers in Cardiology Conference in China. For more details please see the link above. Good Luck!!