this generator/manager will allow you to create a code for a URL - then change the URL to different resource - I'll be using this to create QR codes that will appear in our yearbook and launch students to events that occur after publication of our yearbook: prom, awards dinner, graduation, etc.
system for sharing digital library, soon to offer integration with curricular tools, also have suggested hardware to run system; getting a lot of "buzz" this year, no idea about cost as of yet
from "Building 21st Century Citizens and Schools" presentation at PETE&C 2011; note the "Technology Support with Students - The 21st Century A/V Club" presentation