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Digital zoom doesn't give you anything more than just cropping in on a section of an image and making it look bigger, unfortunately. It doesn't give you any more detail or pixel data in the area you want to concentrate on, like optical zoom would.
Optical zoom will actually give you the full number of pixels in the frame that you've set your camera for, just on the area you've zoomed in to. Digital zoom will give you only some portion of that total pixel data.
For example, if you use digital zoom to close in on an area that is in the upper one quarter of the normal frame, you will only end up with one quarter of the pixels in your image that you would have had if you had used optical zoom.
I never use digital zoom. If I just want to crop in on an image and print it large, I do that later in Photoshop.
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