Two great uses for the barcode scanners:

1. When out shopping with the missus, start scanning everything she puts in the cart and declare "Thats X dollars cheaper at store X". She will never want to take you shopping ever again, stay at home, drink more beer!

2. Serial Storage. When I get new equipment in and I need to record the serial numbers for warranty purposes, I scan them into my phone and either export or email them out.