Hack Your Life! posted a quick guide about creating a bootable USB flash drive from ISO Image

You may need to use a USB thumb drive (Pen Drive) or other flash drive (e.g. SD or SDHC or CF in a suitable card reader or adapter) for installing an Operating System (OS). The reason could be that you are installing it on a Netbook or an older computer which doesn’t have an optical drive or you just don’t want to waste a CD or DVD for a one time job.

UNetbootin makes the creation of bootable USB Drives or Flash Drives, for Linux distributions, in Linux or Windows a child’s play. No more typing of terminal commands, no more partitioning and hacking.

  Create Bootable USB / Flash Drive From ISO Image in Linux or Windows