Hey, OS installation program developers, please support USB!
As much as I love playing with Linux distros, I'm not about to run to the local store to buy CD's or a DVD to burn! I have USB drives that are ten times more reliable and faster than the CD drives, and I don't want to buy yet another disc that will end up in yet another landfill.
Ubuntu and Debian's text installer also don't support USB. You can have the files all there, ready to be used. But the installer only checks for discs, not USB drives.
USB dirves are the present of Linux distro installation. With programs like UNetbootin and the Fedora USB Creator, it's a future that needs to be fully embraced. Support it.