Everything about QR codes:

• in Wikipedia
• Trailmeme links
• Global growth of mobile barcode usage
• Market research Infographics
• Densho - All About

Creative uses:

• Library usage
• Delivr: creating mobile web pages to share with QR codes
• Namecards: Create your own name card
• Graphic Design
• ShareSquare: Event marketing, FAQ & BestPractice,
• 2d-code
• 50 creative ways for QR codes
• Hidden sounds
• Signals in the city
• QR Codes in Education, Learning & Marketing
• Educational Web Sites
• Telling a story with QR codes
• Use in Early Childhood
• Use in elementary school in Dubai

QR code readers:

• Online-Flash QR code reader
• Desktop
  

QR code maker:

• QRcodemaker
• Raco barcode generator
• ... and more

Creative generators:

• uQR.me
• QRphoria
  
• http://www.qrhacker.com/
  
• http://qrphoria.com/
  
• http://www.visualead.com/
  

Re-designing QR codes:

• How not to screw up your QR code partI part2
• How to put your logo in a QR code
• Creative pictures
• Use Photoshop etc

Examples for application:

• ELTE T@T lab cube (HU)
  
• ELTE University Faculty of Informatics (HU)
• Full course page at MOME