CueCat
en.wikipedia.org
en.wikipedia.org
http://www.librarything.com/cuecat
Wish I knew about them in college - would've made my temp job organizing a small department library much easier.
I think that was around the time the i-Opener came out the $99 Internet appliance that people noticed had a hard drive header and accessible bios:
It was an interesting technological toy. But something was missing, and it sank quickly. I cannot quite figure out what was wrong. Most likely not on the technical side.
We were very close to buying a couple thousand cuecats for it. I don't remember why we didn't, I think because they were not reliable (sliding the wand, vs. point and click for the gun types).