Touchatag tags are standard issue NFC tags that cannot be overwritten, read more
by jmknapp, 18 Feb 2009
The T-Mobile G1 doesn't have RFID capability, but the app "Barcode Scanner" available in the Android Market recognizes 2-d barcodes using the camera. I just verified that it works with touchatag barcode urls. After locking in on the barcode, the G1 presents a screen "Found URL, http://ttag.be/..." from which you click "open browser" & it goes to the linked page. Cool.