Perl, PHP and Python make up the "three P's", the most popular dynamic languages for writing Web applications. These and other Open Source projects have large communities of programmers offering help and support. Here's our top links:
The Perl Directory
The Perl Directory - Perl Documentation
The Comprehensive Perl Archive Network (CPAN)
The Ruby-Doc.org Ruby Documentation Project
Mashable Social Networking News - 30+ Joomla tools and resources
If you would like to recommend any PHP/Perl/Python or other opensource resources (websites/newsgroups,user groups etc) please email your suggestions to info@itmob.co.uk