iSight Barcode Scanner Script
    -  Modified to use a login hook after initial login via password (or not)
    -  Loads before the Finder can load
    -  Programmed to accept a predetermined number (same as barcode) and nothing else
    -  Once the correct number is entered, will tell OS X to load the Finder

Okay, so this sounds possible and completely free with the least knowledge of programming necessary.  Does this sound sane?  Am I missing something here? 

...and yes, I keep creating new posts because I want to keep records of this so others can add to it...
MacBook 2GHz Intel Core 2 Duo w/ 2GB DDR2 RAM & 120GB SATA 5400RPM HDD
Canon Rebel XTI
Google Cr-48 Beta Laptop