Lil QR used to provide a free QR Code Generation Service.
Unfortunately due to my lack of free time to continue developing the application I decided to turn our free QR code generator off.
Lil QR is now a resource for everything about QR codes. I try and update it regularly and share interesting whys you can use QR codes in marketing, inventory management and promotions, etc.
If you would like to contribute a guest post on QR codes feel free to contact me.