The first batch of Google’s Nexus One phones have a QR Code on the back, normally photographed taped over. The image below shows the QR Code without the masking tape and it decodes as http://www.android.com/holidays. If you are accessing the url with the Nexus One you will see a new version of the classic game “Memory”. User agent detection will redirect you a “Meet Android 2.0” page if you use a non-compatible device (like a PC!).