I would recommend removing a link to Tony-the-thief's tutorial regarding dual-boot. It's a piece of shit as almost everything on his website...

If I have some time I may create a better tutorial but there isn't much to care about.

Simply install Mac OS X (partition the hdd including a FAT partition for Windows - later to be reformated to NTFS using Windows installer) - only remember not to add/remove any partitions using Windows installer - otherwise your partition table may get damaged! After that - install Chameleon using boot0hfs method and that's it - fully working dual boot setup is here (got it on my Asus too).

+ to that user who wants to install the system on MBR paritition table - I'd rather repartition the whole drive. MBR installs aren't the best ones, I've heard of some problems sometimes + in case of Asus, you can use your Windows serial number to activate the system without need of using recovery partition. Only get a clean (not pre-activated like some shit on torrents...) ISO of your version of Windows (or edit some files to get multi-version edition), install it and activate using your previous serial number. It's completely legal (if you have a license you can get the system from anywhere) and works - you only need to use phone activation, otherwise it won't. Good luck!