Delicious Library should support any USB barcode scanner that sends data in the same fashion as a keyboard. The CueCat scanner does not fall into this category, but the following instructions allow you to modify the CueCat to be more compatible.

How to modify your CueCat barcode scanner (1965 USB Models): The USB models has an onboard 16 pin SMD component. This IC will have a serial number on it similar to the following sequence: K130A033 HMS91C7316 0027. Simply lift pin 5 on this device (The small dimple in the lower right-hand corner indicates pin 1). Congratulations, your USB CueCat is now functioning as a commercial barcode scanner.