 
For those of you with CueCat scanners, there is a much easier approach to making these devices useful than many of the software solutions out there. I have several revision C CueCats that I successfully turned into regular barcode scanners by simply scratching off the trace to pin 10 on the Hyundai microcontroller (8051 variant). Here are a couple of links to help with this:
http://www.cexx.org/cuecat.htm#neuter
http://airsoldier.com/~cuecat/
On mine:
shield = gnd
brown = 5+
orange = data
yellow = clock
I had intended to make an inexpensive bootstrap loader with the CueCat, but the combination of dealing with the barcodes and the amount of electronics needed to decode a PS/2 keyboard stream of characters from a scan is too complicated. The best way to read this data is with a microcontroller, defeating the purpose of a bootstrap.
To generate barcodes, you can use GNU Barcode. To generate a barcode (594389) readable by the CueCat I used "barcode -b 594389 -e UPC -o output.ps".
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