I don't have CS4, but if it is anything like CS3, there should be a small menu icon at the top of the library that when accessed includes an option to select unused items. You should then be able to right click the selection(s) and delete them all from the menu that appears. I recommend trying it on a copy of your file rather than the original... just in case.
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In the Library panel, the "Use Count" will tell if the item is in use or not.
You and Ned Murphy replied at the same time with two different, but both correct answers . I selected "Correct" for Ned and now can't select "correct" anymorel. Sorry
Thank you both