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Unfortunately you weren't around to try out the 7 Release Candidates which were downloaded in iso format. Besides burning the iso disk image to a blank dvd you could have also made up a usb key from a flash drive. USB Windows 7 Installation Key Drive - Create
The tool mentioed in the guide there will also take any of the smaller distros or even a GParted iso to make up a live flash drive. For those now purchasing 7 online without media or while waiting for a backup disk can now a tool for usb devices MS now provides as well. Windows 7 USB/DVD Download Tool