Using your cell phone as a concealed video recorder
If you have one of the new LG CU500 cell phones (or a comparable phone with video capabilities), add a Micro SD chip and record video with it. With a 1 Gig SD card set to the highest resolution, I can get 4.25 hours of audio and video recording. I place my phone holster on my gun belt and the camera faces the suspect when I assume a field interview posistion. It's nice backup to have in court. I've even sent it in with an informant and recorded dope buys.