The smallest digital zoom of small total megapixels video cameras that have been available for more than two years is 1.5x, the biggest is 3,500x, and the average digital zoom is 760x. With a digital zoom of 2,000 times zoom factor, the HDC-SD80 has one of the bigger digital zooms amongst small total megapixels video cameras of this age.
Other 2,000x (digital) camcorders currently available which you might want to look at include the Panasonic HDC-HS80K which has better reviews.
If you want a bigger digital zoom then you might want to consider the HC-V500 (2,500x and higher rated), or the HC-V160 (£129.98) (2,500x and higher rated) both from Panasonic or the Sharp HC-V130 (2,500x and higher rated).
What does "digital zoom" mean?