i think there are enough webservers out there that should run with small or no modifications on the iLiad. (one example
http://www.lighttpd.net/, can be run with PHP FastCGI). Anyone care to throw the lighttpd source into the compiler chain? And for the wiki, I like DokuWiki, it does not require a datase, because it just uses a flat-file structure.
The only thing with PHP is, it will eat a good bunch of RAM.