Here's some of my favourite/interesting links from the www that help me with web dev.
Links / Apache
Excellent resources for speeding up your website (with caching tips and ideas)
Author: Easy Mod ReWrite
Without having to manually create each subdomain you can setup some rewrite rules which dynamically point to the path of your choice.
Some great snippets of what the .htaccess is capable of!
designed & developed by Alex Pashley.