Howtoforge posted a guide about installing Ubuntu or Fedora from a Windows or Linux system with UNetbootin
UNetbootin is a tool that allows you to install various Linux distributions (Ubuntu, Fedora, Mandriva, OpenSuSE, Debian, ArchLinux) from a Windows or a Linux desktop over the internet (i.e., you do not need to burn the Ubuntu, Fedora, ... CDs). Unlike the Ubuntu installation with Wubi, real partitions are created during the installation. In the end, you have a dual-boot system (Linux/Windows or Linux/Linux).Installing Ubuntu Or Fedora From A Windows Or Linux System With UNetbootin
