QR-Code + Windows Mobile
Some time ago a friend told me about QR-Codes. Before that I had already seen some of them in instant messaging avatars, without knowing the meaning of those images. QR-Codes look like this:
This is a kind of barcode like the ones that you see in the super market, but that can store a lot more information. Take a look at the Wikipedia entry about QR-Code.
An interesting thing about this format, is that there is a lot of software available for mobile phones and even windows mobile, that allows you to read these barcodes using your mobile phone’s camera. It is a nice way of sharing contacts (phone number, e-mail, URL’s) or a simple message (how about wearing a t-shirts, allowing your geek friends to read the message? 
)
A nice software for Windows Mobile is i-nigma barcode reader. Just point your camera at a QR barcode, and read the message!
A nice usage of this technology is present in the Windows Mobile free software directory freewarepocketpc.net. You can browse for software in your computer, and when you want to install an application in your device, instead of connecting it to the computer to transfer the cab file, or copying the download link by hand, just point your camera at the QR-Code in the download page, and download the software using the link encoded in the barcode image, reading it with i-nigma, or other similar software.
Believe me, it works pretty well. I wasn’t convinced until I tried it by myself.
Thanks for the introdution to QR-Codes, Nelson and thanks for showing me i-nigma, André! 
how instal in my device htc 8525
I installed the i-nigma QR reader and it launched just fine. But the video for scanning was reversed and I had no success in getting it to identify any QR codes. This was on an HTC S621 Excalibur Windows Smartphone.
The Quickmark version had better success, quickly locking in on numerous barcodes, but only able to decode a few of the URL ones. Then the program would just exit out with no error or explanation.
BeeTagg seemed more stable, as it switched to my native camera for scanning. But it provided no indicators to let me know when it had locked on, so it was ‘hit and miss’ success. I was able to read someone’s business card information.
Unfortunately, I don’t really feel I’ve found an adequate Windows Mobile Smartphone solution for QR-code reading yet.
Thank you,
Timothy McDoniel