I used this http://eu.v-com.com/product/System_Commander_Home.html to do exactly what you want on my laptop when the first osx4x86 was released and it was very easy to use and remove things when needed.

I have an older hp nc6000 that is relatively easy to pull out and swap harddrives, so I just have seperate harddrives for each OS and bought the drive brackets on ebay for $5 each...so now i have a windows drive, osx drive and linux drive..but lately all i use is the linux one.