WE have PHP, Linux, Apache, MySQL, Perl and Python as tags. We also have PHP as a colourisation option in the language dropdown while creating articles in the WYSIWYG editor. Plus, we also have PHP, Linux, MySQL, and Perl forums. I'm not sure where you get the impression there's a bias against PHP and LAMP. We fully support and absolutely encourage articles and questions on this topic. Articles should be posted in the correct section by Topic, not technology, unless the technology is itself the topic. For example, an article on writing a page using PHP will go under Web Development, but will be tagged PHP. I hope this clarifies things.
cheers, Chris Maunder The Code Project | Co-founder Microsoft C++ MVP