QR Codes- 2D Barcodes - How cool?!

Have you noticed these square blocky things on telly and in various other places and wondered what they're all about?

They are 2 dimensional barcodes known as QR Codes (Quick Response Codes) which can contain a lot more information than the barcodes you're used to.
For example, the one above contains UKBITS Limited contact details, name, phone number, website details and email address.
If you scan it using a suitable app on your smartphone (see below!) it will display these details and offer the choice of adding them into your contacts - no need to type it all in manually!
The ones on the TV are for such things as Recipes on cooking programmes.

You can use these codes to convey various different types of information such as:
Text
Website URL
Telephone number
SMS Message
Email Address
Email Message
Contact Details (VCARD) - as above
Calendar Event (VCALENDAR)
Google Maps Location - works with phone mapping for sat nav.
Wifi Login (Only on Android)
Paypal Buy Now
Facebook Profile/LikeLinkedIn Profile/Share
Myspace Profile
Twitter Profile/Status update
iTunes Link
YouTube Video

We've tested various smartphone scanner apps with this and the most impressive by far was 'i-nigma'.
Give it a go, download it and try scanning something like this link below to WikiPedia's page about these QR Codes!