Originally Posted by TheMajor
You can add more OS's if they are supported by the bootloader, using "bootcfg" in XP Recovery Console, or by using the "repair" thing when booting the Vista disc.
I don't know if you can rename stuff in Vista's bootloader, but you probably can. Titles are editable in boot.ini when using XP's boot loader.
Anything but another version of Vista is put under the previous versions of Windows option even Linux there. But you have to enter Windows into the Grub menu.lst file for that type of dual boot. With XP notepad can easily edit the boot.ini file after you uncheck the hide protected system files option(for advanced users only there).
To rename "previos versions" to Windows XP the EasyBCD was the tool for Vista. But it usually takes a little more then an edit to add an OS in. The addin OS has to be detected somehow by Windows as well as having an entry into the mbr.