Here’s an interesting project we found on Kickstarter. Known as RadioBlock, this device promises to provide a simple “radio building block” for your embedded projects. The blocks have a four pin connector, two for 3-6 Vdd and ground, and two for TTL serial comms. The RF link consists of an IEEE802.15.4 Atmel RF231 module and LPC1114 (a 32-bit ARM Cortex M0 device) which work together to provide connection to similar modules on a SimpleMesh network. The devices are already FCC approved.
For project details, including user manual and other docs visit the RadioBlock Kickstarter page.