don't bother with digital zoom, it's pretty much rubbish. Optical zoom is like walking closer to your subject. But digital zoom is like taking a photo and then blowing it up: the bit you want gets bigger but it also gets fuzzier, the closer you go.
Also, some cameras have anti-shake technology, which is useful if you're zooming in on something - but it doesn't usually work in digital zoom. So actually you'd get a clearer picture by blowing up a picture taken with optical zoom than by zooming in further with a digital zoom, which will very often be shaky. (A teensy shake doesn't matter when you're photographing a landscape but when you've zoomed in on a person 100 metres away, the effect is greatly magnified, that's why they have the image stabilisation thingy.)
I keep mine turned on anyway, but I make sure I don't accidentally zoom into digital range unless there's some reason I really, really want to.