Wouldn't this be the same way that you do with windows vista? I think it is!
Watch this: haxttp://wewewe.offensive-security.com/videos/dual-boot-backtrack-vista/dual-boot-backtrack-vista.html
(You need to fix the url since im not allowed to post urls before my 15th post)
The process should not depend on what other operating system you have, so you should be fine with this.
//Daniel



