You techies probably know about this already but I am posting this for everyone. It my first Freebie so go easy!
This program is completely free open source and can be downloaded. All you have to do is burn it to a cd and you have a complete operating system, browser, applications, tools that can be booted from a disk!
If your PC fails and you can't access important data, just pop in the cd and it will start up your machine and you can copy your files over a network or to disk/USB drive. It can be used if you need to sit at a temporary machine for word processing, etc.
Not sure how useful it may be for you but my pc crashed and used this disk to recover all my data before formatting my hard disk.
Remember it's free! So how can it be voted cold?
Knoppix, a Free and Open Source Live Linux CD. Knoppix is a GNU/Linux distribution that boots and runs completely from cd. It includes recent linux software and desktop environments, with programs such as OpenOffice.org, Abiword, The Gimp, Konqueror, Mozilla, Apache, PHP, MySQL and hundreds of other quality open source programs.http://www.knoppix.net/