I actually got here from info about a PIC controlled one.
You can buy a 1D one here with PIC code.
http://www.electronickits.com/kit/complete/meas/ck112.htm
It is based on this 2003 article:
A group of people have taken that design and tried to configure a 2D version. atmega version
http://hackerfleet.org/dev/wiki/MS0x00/Sensors/Wind
I came running from PIC. Hoping to disassemble a couple of pings and use them.