Thanks Con but you don't necessarily need a tripod. This image was taken freehand quite some time ago. Unfortunately, I cannot remember the exact details but I think it was shot at 400mm or 500mm (might even have been 300mm) with a shutter speed of around 1/300th of a second and large aperture (about f/5.6). The image would have been cropped in quite a bit and then sharpened in Photoshop (you have to do the latter when photographing in RAW as opposed to Jpeg).
Anybody with a reasonable size zoom lens (say 250mm to 300mm) and a camera with controllable shutter speed should be able to achieve fairly good results. Don't rely on the camera to do it automatically as the sensor will assume that because the surrounding sky is dark it needs a slow shutter speed. Actually, the faster the shutter the better since this will help prevent camera shake and, despite appearances, the moon is really travelling quite fast. It takes a fair bit of practice, trial and error, and quite a few attempts to get one decent effort though.
This site gives some excellent advice for photography tips for moon shots;http://photography.about.com/od/photogr ... nshots.htm