Boot Boot is the spiritual successor to boot.kernel.org, a system allowing for the booting of systems over the Internet as well as giving an example setup for having useful network booting infrastrure.
The simplest way to test this out is to snag one of the images to the left (~304KB in size), and fire up a VM. For those of you on Linux the easiest way to test it is:
qemu-system-x86_64 -fda bootboot.dsk -m 2G
Just to break that down a little: