I have to mention this, because I've been banging my head against this for days: The latest version(s) of this library will not work on the Arduino Leonardo! I have a Duemilanove and it works fine on that. Until the lightbulb popped up over my head and I decided to try it on the Duemilanove I was ready to pull out what little hair I have left!
Thanks very much for all the hard work put in by everyone here.