Howtoforge posted a guide about setting up a dual boot between Windows 8 and Linux Mint

If youre a serious operating system geek, you might want to test out both Windows 8 and Linux Mint. Heres how to get the best of both by dual-booting Linux Mint with your Windows 8 installation.
Before we start there is a couple of things that you are going to need:

10GB of free space on your drive
The Linux Mint DVD, from here (x86) or here (x64), burnt to a DVD.
About 30 Minutes of free time

  How to Dual Boot Windows 8 and Linux Mint on the Same PC