What are some USB boot disks you have found most useful? I'm thinking of software that you keep on a bootable USB thumb drive that is your own personal Swiss army knife of neat software you use when computer needs some work that can't be done from in the OS it self. Mostly things like drive partitioning and imaging.
In the past I've just kept a live linux CD/DVD around so I've been considering just putting my favorite Linux distro on USB key but I was wondering if there is anything else interesting out there designed for USB thumb drives.
