HOW TO: Installing Multiple OSs Without A Floppy/CD/DVD/Etc
This article explains how I managed to install over 50 various operating systems on my computer (1 hard drive) without having to burn 
the distro ISO to disk to boot from. (No floppy, usb, cd, dvd, etc. needed!) I first partitioned my 120GB harddrive into 10 partitions, the 2nd partition is a small swap and the last partition is extra large because it holds all the ISO images.. Installing Multiple OS’s Without A Floppy/CD/DVD/Etc. | HowtoForge - Linux Howtos and Tutorials