This 50mm Round Tag is a 125 KHz RFID Tag.
The Parallax RFID - Credit Card Tag is a 125 KHz Credit Card sized RFID Tag.
This is a nifty blue fob tag for all you wonderful fobbing needs.
The Parallax RFID Reader Module is a 125 KHz RFID reader, with a USB connection.
The Phidget RFID - Credit Card Tag is a 125 KHz Credit Card Sized RFID Tag.
PhidgetRFID reads and writes RFID tags that are brought in close proximity.
If you aren't familiar with the Electric Imp, it essentially provides an easy, integrated way to connect almost any hardware device both to other WiFi enabled devices and to internet services.
The PICAXE Connect board lets you hook up a Digi XBee module or LocSense GPS module to your PICAXE or (using a MAX3232 chip) a computer.