netboot.me is a service that allows you to boot nearly any operating system or utility on any computer with a wired internet connection – without having to know ahead of time what you’ll want to boot. Once you can netboot.me, you never need to update your boot disk again!
netboot.me works through the magic of netbooting. There are a number of ways to boot a computer with netboot.me. The simplest is to download a bootable image and burn it to a CD, USB memory stick, or floppy disk. Boot off it on any networked computer, and it will automatically fetch the latest boot options from netboot.me and let you choose from dozens of installation, recovery, testing, portable desktop and other tools. You can also start netboot.me from any computer running gPXE, or from any netbootable computer with some simple tweaks to your DHCP server. (source: netboot.me)