This has to be one of the coolest utilities I've come across. XBoot
It lets you combine several bootable ISO's together. It's similar to MultiCD, but it runs in Windows.
It even lets you test / preview the resulting disk & menus in a built in lite VM.
I used it to make a combined Clonezilla / Gparted / Memtest86+ / Ubuntu bootable image that I put in a 2GB FAT32 partition on my 2.5" 1TB Samsung HD in it's external enclosure. Now I can boot from the 1TB 2.5" drive and do partitioning, imaging, memory testing, or boot into Ubuntu to mess with files on the system I'm using. In addition the other 900+ GB of the 1TB drive can be used for storing images.
I wasn't a fan of the original menu structure, which force categorizes your programs under submenus since I wanted them all in the main menu, but that was easily fixed by a little manual editing of the syslinux.g4d file after the drive was setup.