Thanks for the input.

I've been messing around with using mod_rewrite, and also integrating a Cache class into my application.

Would it benefit the server to do the straight mod_rewrite for a file? Or in the Cache class, serving up the static html document?

Also if I'm using mod_rewrite for caching, is there a way that I can have the Cached documents expire after aging? Sans running a cron-job.

On a side note, are there any ways that I can perform a test for how CPU intensive a script is? I want to work on optimizing my sites for large scale and I'd like to gauge how well it's doing on a small scale first and determine if it'll expand well.