If you're not switching to a phpnuke or equivalent (which offers everything already integrated) you can beef up your sections using open source scripts.

I think you should start with the faq/knowledgebase:

http://www.boesch-it.de/english/index_java.html

its under PHP-scripts, called FAQengine.

license: This program is Freeware. You are allowed to use this for free in non commercial and commercial environments.

Then there are some really good picture gallery scripts and link indexers.

Just a thought.