Warning - this may be out of date, it is over 5 years old at this point
This morning I wrote a script to help automate installing Magento websites, I figured I would chuck it up onto github for feedback and on the off chance it would help someone.
https://github.com/tosbourn/Magento-Auto-Install
If you are a Magento dev I would love some feedback - When I get chance I will write up what I will be adding to it in the future. I will also write up a proper guide to replace the README file.