Various configurations of systems that employ leadless electrodes to provide pacing therapy are provided. In one example, a system that provides multiple sites for pacing of myocardium of a heart includes wireless pacing electrodes that are implantable at sites proximate the myocardium using a percutaneous,...http://www.google.com/patents/US20060085039?utm_source=gb-gplus-sharePatent US20060085039 - Leadless cardiac stimulation systems