The moon was almost full on a perfect Cape winters evening. Good time to experiment with the zoom on my Canon Powershot SX20 IS. I am very hesitant to use the digital zoom on any camera but as you can see from the photo at the bottom, even at 4x Digital, it is not that bad.
Focal Length: 53.8mm (10.7x Optical and no Digital) 
Focal Length: 100mm (20x Optical and no Digital)
Focal Length: 100mm (20x Optical and 1.54x Digital)
Focal Length: 100mm (20x Optical and 4x Digital)
One can see it is a bit grainy at 4x Digital but anything between 1.5x and 2x Digital is great.
Click on the image to see a larger one. Also you can see more in my Picasa Album.