Texas Instruments MSP430
One of my old projects was working with wireless network sensors - "motes" using Atmel AVR microcontrollers. These were originaly developed at UC Berkeley.
Check out the TinyOS Community and MEMSIC for more information.
This is an example of some data from a Mica2 mote with a 2 axis accelerometer.
The mote is being rotated across the x and y axis. When the accelerometer axis is at right angles to the ground you see a positive or negative bump.
The data is being saved in flash memory on the microconterller and sent in "real time" over a 900MHz radio link to a radio transceiver - ethernet bridge connected to a PC (this a screen capture from the PC).
The PC software is a Windows program written in C/C++.