cd images (a.k.a. ISO files) are a very valuable tool. Given that you have a reliable program to make them, you will be able to back up your CD's either on your computer or on other CD's so that in the event that one should loose the original copy, one will not have thoughts of jumping off a 20 stopry building becuase the disk for adobe photoshop cost you 500+ dollars to buy. (get my drift?)
They are also useful in emulating PS games as they reduce the time required to access the data and therefore reducing lag and stuttering in the game. They have many mroe uses, but too many to describe in full.
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