Not sure about anyone else, but acquiring this has taken me YEARS to find a simple, idiot-proof USB flash drive boot disk creator for a WinXP setup install (or linux or whatever). As long as your bios can boot to usb flash, you can replace your CD/DVD setup disk with the flash drive. The OS will install faster too!

http://en.kioskea.net/faq/sujet-3065-installing-windows-xp-from-a-usb-key

..and the proggy to do it (it's free!):
http://www.datafilehost.com/get.php?file=109e97af

Other programs have tried, this one has squarely hit the mark.
[Submitted by wily duck]