I am hoping to be able to create a USB drive that I can put a few installable Linux distributions, as well as Windows 7 and Mountain Lion. I would also like to be able to add a few tools (such as Memtest86+ amongst many others). Of course it is very easy to do just that if all you wish to do is boot into Windows, but I am finding that it may be impossible to do this for a Mac. I did successfully get Ubuntu onto a USB drive and was able to boot on my MacBook Pro. However, any other attempts at "multibooting" do not show up on my MacBook Pro when I arrive at the boot menu. Am I correct in thinking Mac's take a GUID table instead of a MBR? If this is the case, will a PC even know what to do with a GUID table? If anyone has any experience with anything boot related and Mac's, please let us know!