Despite we do not yet carry shutter cables for Canon 400D..1000D, we tried an off-the-shelf 3.5mm to 2.5mm audio cable as a shutter cable for 450D today. And it worked! We will soon start carrying those cables as an official Promote Control accessory. Meanwhile, all of you Canon 400D/450D/500D/1000D folks – shutter cables are coming, right along with all associated goodies – faster HDR sequences, automatic Bulb for >30 second exposures in HDR, Manual Hold and so on. Stay tuned 