I got a Zoom H1 stereo digital recorder. It has a standard tripod thread on the bottom & with a little hotshoe gizmo fits on top of the camera. It records sound to a memory card or you can use a wire to connect it to the input on the camera to record direct to the camera as well.
Either way, when you create your video you have a high quality digital stereo soundtrack.
I looked at the Rodes above but decided to opt for a microphone/recorder so I can use it standalone to record concerts.
http://www.zoom.co.jp/english/products/h1/
