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.
This is a simple breakout board for the popular XBee product from Maxstream.
This easy to use and low cost module is capable of sending and receiving serial data wirelessly between microcontrollers or to a PC. The low power consumption makes this module ideal for use in battery powered applications.