I stumbled across this guide a few days ago and just got around to trying it out, however, I'm running into a slight problem and was wondering if anyone could help out. I currently have 10.5.7 installed on my system but wanted to try out 10.6 but when I try the posted installation method I get a warning and am unable to install on the partition I want. The warning says i must repartition the disk as 'GUID Partition Table' before I can continue. I realize that I could do this using the diskutil tool, however I have been using that particular hard drive for some other things and don't want to fully repartition the drive. I'm curious to know if there is some clever way around this or if reformatting is my only option. I've tried a poking around in a GParted live cd, with no luck.