UNetbootin, Universal Netboot Installer

Found this utility on SourceForge This small utility will take any .iso image that is bootable and write it out to a USB flash drive.  I used this recently to move the VMWare ESXi 5 image to a USB stick to install on an HP Proliant server.  It worked beautifully.  If you are looking to take any .iso and have a bootable USB flash drive, this is the one.  Very easy to use.