It think that in addition to popularizing the language this is a good resource for learning the language. (I learned just while writing the examples -- I didn't realize the power of closures until I played with them for this project.)
First, I would encourage anyone interested to register with the site and contribute a few examples (or improve some of the existing ones). It's easy, even if I took most of the easy ones -- many of the tasks are handled by built-in functions.
Second, if anyone has experience with GeSHi I would appreciate feedback on setting up syntax highlighting in that system for GP. My first attempt is here, along with a brief discussion of the issues I found: http://rosettacode.org/wiki/Rosetta_Code:Village_Pump/Syntax_Highlighting#PARI.2FGP
This would allow not only Rosetta Code but Wikipedia, OpenOffice, and individual websites to highlight GP scripts, which I think would be cool.
Third, there are some tasks I have avoided coding because I can't find any good way to do them in GP. Not that I can't do them -- GP is Turing-complete, after all -- but I feel that these should have an easy solution and I hate to submit a clumsy solution if an elegant one might be at hand. For example: http://rosettacode.org/wiki/Reduced_row_echelon_form http://rosettacode.org/wiki/Polynomial_regression
I feel less bad about having no solution or a poor one on nonmathematical tasks: it's 'showing off' to even attempt them. But maybe there is an elegant way and I just don't know it?
Charles Greathouse
Analyst/Programmer Case Western Reserve University