One of the hottest new technologies in computer interfaces is Microsoft Surface which uses multi-touch to allow several items (like hands for example) to control things happening in software. The hardware for this is a bit expensive. OK it’s a lot expensive. Microsoft recently released some software as an open source project that makes this technology a lot easier and less expensive to try out. It requires a webcam to use and the following Touchless SDK video shows what it is about.
You can get the Touchless Software Development Kit here. Might be just the thing for a senior project, an independent study, or just to do something completely different and unexpected.