I discovered Campaignr, an open-source project for sampling data from the various sensors on a cellphone, including camera, microphone and GPS. I’m having some issues with it connecting to a wireless network. If anyone has any ideas, please get in touch via the contact page. I’m also looking into manipulating the files it produces manually. I could make my own Java applet, but I’d rather not reinvent the wheel, and it would be more productive to spend time dealing with these sensor outputs.