If you are an Android app developer like me, then once you have published your mobile app to the Android market you might want to promote your Android apps with QR codes (= quick response codes). Feel free to use the Android QR code generator at Rittr Labs | QR Code Generator for Android Apps You can generate (1) links to your app's website, (2) links to the app's details page in the Android Market, or (3) links to any free-text search query that you would like to do on the Android Market. Based on user feedback to generate color QR codes as well, the tool can now do that, too. So you can choose yellow backgrounds and pink foregrounds, purple backgrounds and gray foregrounds, etc. for your QR codes-- whatever your heart desires. Note: black and white is still what the QR code scanners can decipher best.