Source code: linked below
Grab it here (itunes link):
Or search for Fat Tag on the App Store
http://fffff.at/fattag-source/OF-006-iPhone-Fat-Tag.zip . If you want to compile and run the code on your device – read some of the guides posted here.
The expressions published in this site are all in the public domain. You may enjoy, use, modify, snipe about and republish all F.A.T. media and technologies as you see fit.