I uploaded the first release of Math-GrahamFunction to the CPAN. It is used to calculate the Graham Function of a natural number, and is based on code I wrote for this Perl Quiz-of-the-Week, after a lot of OOP and refactoring.
The code has polynomial complexity, as opposed to many of the solutions originally posted for the quiz. I'm not aware of any practical applications of Graham's function, but the code is there for your use and abuse, under the MIT X11 licence. I already received several CPAN testing reports, including one (and only one) failure.
That's it I suppose - just wanted to let you know.