XAMPP is an integrated server package of Apache, mySQL, PHP and phpMyAdmin (the AMPP in XAMPP) that all run from a removable drive. Everything is pre-configured and ready to go just by unzipping or installing it.

XAMPP | PortableApps.com

I find myself increasingly reliant on my USB key for letting me work wherever I happen to be. This sounds like a great idea. Then again, not sure how many systems departments would be happy with people running this on their computers.