I have finally made it into more reusable classes for the Arduino.
Project homepage: Google Code Archive - Long-term storage for Google Code Project Hosting.
It went better than I hoped making classes out of it 
(Not that I think very many will have use for this, I did it mostly as a programming exercise, plus I got a little caught up in the thing)
Use at your own risk though. I make no claim as to the accuracy or usability for anything.
martin_bg:
Interesting, thanks for the link! (Kind of have to like the frequency he got too - 1337 kHz :P)
liudr:
Looking forward to it!
PS! Of course you also have the option to use those classes above I made (but it would take the fun out of it?)