Last year I blogged about my experiences with acceleration signal processing (here , here and here) then the topic disappeared from this blog. Disappeared from the blog but not from my life because the research continued with some partners from the University of Geneva. The paper (free registration is needed for access) will be presented at the 1st International Workshop on Frontiers in Activity Recognition using Pervasive Sensing, a workshop of Pervasive 2011. The prototype was created on Android, you can access it here. Be warned: this is just a research prototype and is not guaranteed to work on anything else than on Nexus One and even on that phone it has some issues. If you happen to be on Pervasive 2011, I am happy to explain its operation personally.
Update: the workshop presentation has been done, the slideset is also available at the same link where the paper is.