[development] Any Drupal Tools for Automating Staging Site Creation?

Hi all, Has anyone created any tools for automating site setup? Basically what I'm doing now each night via a script is: 1) Cloning my production site 2) Replacing certain directories with versions checked out from Subversion 3) Running a series of Linux commands and SQL queries to set up modules that are in development but have not been deployed to production Whenever I start development on a new module I have to add to my mirroring script to automate Drupal setup. I can write some PHP functions to encapsulate this, but maybe something already exists? Cheers, Mike